diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 93de23c9..c1a8652b 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -31,7 +31,8 @@ jobs:
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        # Black declares E203 is not PEP8 compliant: https://github.com/psf/black/issues/315#issuecomment-395457972
+        flake8 . --count --ignore=E203 --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
         poetry run pytest tests
diff --git a/hunter/config.py b/hunter/config.py
index 849b9687..e1a96c55 100644
--- a/hunter/config.py
+++ b/hunter/config.py
@@ -1,9 +1,9 @@
 import os
 from dataclasses import dataclass
-from typing import Dict, List
+from pathlib import Path
+from typing import Dict, List, Optional
 
 from expandvars import expandvars
-from pathlib import Path
 from ruamel.yaml import YAML
 
 from hunter.grafana import GrafanaConfig
@@ -15,8 +15,8 @@
 
 @dataclass
 class Config:
-    graphite: GraphiteConfig
-    grafana: GrafanaConfig
+    graphite: Optional[GraphiteConfig]
+    grafana: Optional[GrafanaConfig]
     tests: Dict[str, TestConfig]
     test_groups: Dict[str, List[TestConfig]]
     slack: SlackConfig
@@ -30,14 +30,14 @@ class ConfigError(Exception):
 def load_templates(config: Dict) -> Dict[str, Dict]:
     templates = config.get("templates", {})
     if not isinstance(templates, Dict):
-        raise ConfigError(f"Property `templates` is not a dictionary")
+        raise ConfigError("Property `templates` is not a dictionary")
     return templates
 
 
 def load_tests(config: Dict, templates: Dict) -> Dict[str, TestConfig]:
     tests = config.get("tests", {})
     if not isinstance(tests, Dict):
-        raise ConfigError(f"Property `tests` is not a dictionary")
+        raise ConfigError("Property `tests` is not a dictionary")
 
     result = {}
     for (test_name, test_config) in tests.items():
@@ -57,7 +57,7 @@ def load_tests(config: Dict, templates: Dict) -> Dict[str, TestConfig]:
 def load_test_groups(config: Dict, tests: Dict[str, TestConfig]) -> Dict[str, List[TestConfig]]:
     groups = config.get("test_groups", {})
     if not isinstance(groups, Dict):
-        raise ConfigError(f"Property `test_groups` is not a dictionary")
+        raise ConfigError("Property `test_groups` is not a dictionary")
 
     result = {}
     for (group_name, test_names) in groups.items():
@@ -85,13 +85,22 @@ def load_config_from(config_file: Path) -> Config:
         if Grafana configs not explicitly set in yaml file, default to same as Graphite 
         server at port 3000
         """
-        if config["graphite"]["url"] is None:
-            raise ValueError("graphite.url")
-        if config.get("grafana") is None:
-            config["gafana"] = {}
-            config["grafana"]["url"] = f"{config['graphite']['url'].strip('/')}:3000/"
-            config["grafana"]["user"] = os.environ.get("GRAFANA_USER", "admin")
-            config["grafana"]["password"] = os.environ.get("GRAFANA_PASSWORD", "admin")
+        graphite_config = None
+        grafana_config = None
+        if "graphite" in config:
+            if "url" not in config["graphite"]:
+                raise ValueError("graphite.url")
+            graphite_config = GraphiteConfig(url=config["graphite"]["url"])
+            if config.get("grafana") is None:
+                config["grafana"] = {}
+                config["grafana"]["url"] = f"{config['graphite']['url'].strip('/')}:3000/"
+                config["grafana"]["user"] = os.environ.get("GRAFANA_USER", "admin")
+                config["grafana"]["password"] = os.environ.get("GRAFANA_PASSWORD", "admin")
+            grafana_config = GrafanaConfig(
+                url=config["grafana"]["url"],
+                user=config["grafana"]["user"],
+                password=config["grafana"]["password"],
+            )
 
         slack_config = None
         if config.get("slack") is not None:
@@ -106,12 +115,8 @@ def load_config_from(config_file: Path) -> Config:
         groups = load_test_groups(config, tests)
 
         return Config(
-            graphite=GraphiteConfig(url=config["graphite"]["url"]),
-            grafana=GrafanaConfig(
-                url=config["grafana"]["url"],
-                user=config["grafana"]["user"],
-                password=config["grafana"]["password"],
-            ),
+            graphite=graphite_config,
+            grafana=grafana_config,
             slack=slack_config,
             tests=tests,
             test_groups=groups,
diff --git a/hunter/csv_options.py b/hunter/csv_options.py
index 93125ee7..c26782e6 100644
--- a/hunter/csv_options.py
+++ b/hunter/csv_options.py
@@ -1,7 +1,6 @@
 import enum
 
 from dataclasses import dataclass
-from typing import Optional
 
 
 @dataclass
diff --git a/hunter/data_selector.py b/hunter/data_selector.py
index f932d878..ca6c5080 100644
--- a/hunter/data_selector.py
+++ b/hunter/data_selector.py
@@ -1,7 +1,7 @@
 import sys
 from dataclasses import dataclass
-from typing import List, Optional
 from datetime import datetime, timedelta
+from typing import List, Optional
 
 import pytz
 
diff --git a/hunter/grafana.py b/hunter/grafana.py
index 1abe61dd..a643c9aa 100644
--- a/hunter/grafana.py
+++ b/hunter/grafana.py
@@ -1,13 +1,10 @@
-import re
+from dataclasses import asdict, dataclass
 from datetime import datetime
+from typing import List, Optional
 
 import requests
-
-from dataclasses import asdict, dataclass
-
 from pytz import UTC
 from requests.exceptions import HTTPError
-from typing import List, Optional
 
 
 @dataclass
diff --git a/hunter/graphite.py b/hunter/graphite.py
index f417fe08..2ffb33bd 100644
--- a/hunter/graphite.py
+++ b/hunter/graphite.py
@@ -1,10 +1,9 @@
 import ast
 import json
 import urllib.request
-
 from dataclasses import dataclass
 from datetime import datetime
-from logging import info, warning
+from logging import info
 from typing import Dict, List, Optional, Iterable
 
 from hunter.data_selector import DataSelector
diff --git a/hunter/importer.py b/hunter/importer.py
index 5fe25d4d..7caa71bd 100644
--- a/hunter/importer.py
+++ b/hunter/importer.py
@@ -1,17 +1,22 @@
 import csv
 from collections import OrderedDict
-
+from contextlib import contextmanager
 from dataclasses import dataclass
 from datetime import datetime, timedelta
 from pathlib import Path
 from typing import List, Optional, Dict
 
 from hunter.config import Config
-from hunter.csv_options import CsvColumnType, CsvOptions
 from hunter.data_selector import DataSelector
 from hunter.graphite import DataPoint, Graphite, GraphiteError
 from hunter.series import Series, Metric
-from hunter.test_config import CsvTestConfig, TestConfig, GraphiteTestConfig, CsvMetric
+from hunter.test_config import (
+    CsvTestConfig,
+    TestConfig,
+    GraphiteTestConfig,
+    CsvMetric,
+    HistoStatTestConfig,
+)
 from hunter.util import (
     merge_sorted,
     parse_datetime,
@@ -19,8 +24,6 @@
     format_timestamp,
     resolution,
     round,
-    is_float,
-    is_datetime,
 )
 
 
@@ -107,7 +110,7 @@ def fetch_data(self, test: TestConfig, selector: DataSelector = DataSelector())
                 raise DataImportError(f"No timeseries found in Graphite for test {test.name}.")
 
             times = [[x.time for x in series.points] for series in graphite_result]
-            time: List[int] = merge_sorted(times)[-selector.last_n_points:]
+            time: List[int] = merge_sorted(times)[-selector.last_n_points :]
 
             def column(series: List[DataPoint]) -> List[float]:
                 value_by_time = dict([(x.time, x.value) for x in series])
@@ -281,15 +284,15 @@ def fetch_data(self, test_conf: TestConfig, selector: DataSelector = DataSelecto
                 metrics = {m.name: Metric(m.direction, m.scale) for m in metrics.values()}
 
                 # Leave last n points:
-                time = time[-selector.last_n_points:]
+                time = time[-selector.last_n_points :]
                 tmp = data
                 data = {}
                 for k, v in tmp.items():
-                    data[k] = v[-selector.last_n_points:]
+                    data[k] = v[-selector.last_n_points :]
                 tmp = attributes
                 attributes = {}
                 for k, v in tmp.items():
-                    attributes[k] = v[-selector.last_n_points:]
+                    attributes[k] = v[-selector.last_n_points :]
 
                 return Series(
                     test_conf.name,
@@ -314,15 +317,131 @@ def fetch_all_metric_names(self, test_conf: CsvTestConfig) -> List[str]:
         return [m for m in test_conf.metrics.keys()]
 
 
+class HistoStatImporter(Importer):
+
+    __TAG_METRICS = {
+        "count": {"direction": 1, "scale": "1", "col": 3},
+        "min": {"direction": -1, "scale": "1.0e-6", "col": 4},
+        "p25": {"direction": -1, "scale": "1.0e-6", "col": 5},
+        "p50": {"direction": -1, "scale": "1.0e-6", "col": 6},
+        "p75": {"direction": -1, "scale": "1.0e-6", "col": 7},
+        "p90": {"direction": -1, "scale": "1.0e-6", "col": 8},
+        "p95": {"direction": -1, "scale": "1.0e-6", "col": 9},
+        "p98": {"direction": -1, "scale": "1.0e-6", "col": 10},
+        "p99": {"direction": -1, "scale": "1.0e-6", "col": 11},
+        "p999": {"direction": -1, "scale": "1.0e-6", "col": 12},
+        "p9999": {"direction": -1, "scale": "1.0e-6", "col": 13},
+        "max": {"direction": -1, "scale": "1.0e-6", "col": 14},
+    }
+
+    @contextmanager
+    def __csv_reader(self, test: HistoStatTestConfig):
+        with open(Path(test.file), newline="") as csv_file:
+            yield csv.reader(csv_file)
+
+    @staticmethod
+    def __parse_tag(tag: str):
+        return tag.split("=")[1]
+
+    def __get_tags(self, test: HistoStatTestConfig) -> List[str]:
+        tags = set()
+        with self.__csv_reader(test) as reader:
+            for row in reader:
+                if row[0].startswith("#"):
+                    continue
+                tag = self.__parse_tag(row[0])
+                if tag in tags:
+                    break
+                tags.add(tag)
+        return list(tags)
+
+    @staticmethod
+    def __metric_from_components(tag, tag_metric):
+        return f"{tag}.{tag_metric}"
+
+    @staticmethod
+    def __convert_floating_point_millisecond(fpm: str) -> int:  # to epoch seconds
+        return int(float(fpm) * 1000) // 1000
+
+    def fetch_data(
+        self, test: HistoStatTestConfig, selector: DataSelector = DataSelector()
+    ) -> Series:
+        def selected(metric_name):
+            return metric_name in selector.metrics if selector.metrics is not None else True
+
+        metrics = {}
+        tag_count = 0
+        for tag in self.__get_tags(test):
+            tag_count += 1
+            for tag_metric, attrs in self.__TAG_METRICS.items():
+                if selected(self.__metric_from_components(tag, tag_metric)):
+                    metrics[self.__metric_from_components(tag, tag_metric)] = Metric(
+                        attrs["direction"], attrs["scale"]
+                    )
+
+        data = {k: [] for k in metrics.keys()}
+        time = []
+        with self.__csv_reader(test) as reader:
+            start_time = None
+            for row in reader:
+                if not row[0].startswith("#"):
+                    break
+                if "StartTime" in row[0]:
+                    parts = row[0].split(" ")
+                    start_time = self.__convert_floating_point_millisecond(parts[1])
+
+            if not start_time:
+                raise DataImportError("No Start Time specified in HistoStat CSV comment")
+
+            # Last iteration of row is the first non-comment row. Parse it now.
+            tag_interval = 0
+            while row:
+                if tag_interval % tag_count == 0:
+                    # Introduces a slight inaccuracy - each tag can report its interval start time
+                    # with some millisecond difference. Choosing a single tag interval allows us
+                    # to maintain the 'indexed by a single time variable' contract required by
+                    # Series, but the time reported for almost all metrics will be _slightly_ off.
+                    time.append(self.__convert_floating_point_millisecond(row[1]) + start_time)
+                tag_interval += 1
+                tag = self.__parse_tag(row[0])
+                for tag_metric, attrs in self.__TAG_METRICS.items():
+                    if selected(self.__metric_from_components(tag, tag_metric)):
+                        data[self.__metric_from_components(tag, tag_metric)].append(
+                            float(row[attrs["col"]])
+                        )
+                try:
+                    row = next(reader)
+                except StopIteration:
+                    row = None
+
+        # Leave last n points:
+        time = time[-selector.last_n_points :]
+        tmp = data
+        data = {}
+        for k, v in tmp.items():
+            data[k] = v[-selector.last_n_points :]
+
+        return Series(test.name, None, time, metrics, data, dict())
+
+    def fetch_all_metric_names(self, test: HistoStatTestConfig) -> List[str]:
+        metric_names = []
+        for tag in self.__get_tags(test):
+            for tag_metric in self.__TAG_METRICS.keys():
+                metric_names.append(self.__metric_from_components(tag, tag_metric))
+        return metric_names
+
+
 class Importers:
     __config: Config
     __csv_importer: Optional[CsvImporter]
     __graphite_importer: Optional[GraphiteImporter]
+    __histostat_importer: Optional[HistoStatImporter]
 
     def __init__(self, config: Config):
         self.__config = config
         self.__csv_importer = None
         self.__graphite_importer = None
+        self.__histostat_importer = None
 
     def csv_importer(self) -> CsvImporter:
         if self.__csv_importer is None:
@@ -334,10 +453,17 @@ def graphite_importer(self) -> GraphiteImporter:
             self.__graphite_importer = GraphiteImporter(Graphite(self.__config.graphite))
         return self.__graphite_importer
 
+    def histostat_importer(self) -> HistoStatImporter:
+        if self.__histostat_importer is None:
+            self.__histostat_importer = HistoStatImporter()
+        return self.__histostat_importer
+
     def get(self, test: TestConfig) -> Importer:
         if isinstance(test, CsvTestConfig):
             return self.csv_importer()
         elif isinstance(test, GraphiteTestConfig):
             return self.graphite_importer()
+        elif isinstance(test, HistoStatTestConfig):
+            return self.histostat_importer()
         else:
             raise ValueError(f"Unsupported test type {type(test)}")
diff --git a/hunter/main.py b/hunter/main.py
index db4b58f9..b663478e 100644
--- a/hunter/main.py
+++ b/hunter/main.py
@@ -4,24 +4,21 @@
 import sys
 from dataclasses import dataclass
 from datetime import datetime, timedelta
-from slack_sdk import WebClient
 from typing import Dict, Optional, List
 
 import pytz
+from slack_sdk import WebClient
 
 from hunter import config
 from hunter.attributes import get_back_links
 from hunter.config import ConfigError, Config
 from hunter.data_selector import DataSelector
-
 from hunter.grafana import GrafanaError, Grafana, Annotation
 from hunter.graphite import GraphiteError
 from hunter.importer import DataImportError, Importers
-from hunter.report import Report
+from hunter.report import Report, ReportType
 from hunter.series import (
     AnalysisOptions,
-    ChangePointGroup,
-    SeriesComparison,
     compare,
     AnalyzedSeries,
 )
@@ -91,15 +88,19 @@ def list_metrics(self, test: TestConfig):
             print(metric_name)
 
     def analyze(
-        self, test: TestConfig, selector: DataSelector, options: AnalysisOptions
+        self,
+        test: TestConfig,
+        selector: DataSelector,
+        options: AnalysisOptions,
+        report_type: ReportType,
     ) -> AnalyzedSeries:
         importer = self.__importers.get(test)
         series = importer.fetch_data(test, selector)
         analyzed_series = series.analyze(options)
         change_points = analyzed_series.change_points_by_time
         report = Report(series, change_points)
-        print(test.name + ":")
-        print(report.format_log_annotated())
+        produced_report = report.produce_report(test.name, report_type)
+        print(produced_report)
         return analyzed_series
 
     def __get_grafana(self) -> Grafana:
@@ -188,10 +189,10 @@ def remove_grafana_annotations(self, test: Optional[TestConfig], force: bool):
         if test:
             logging.info(f"Fetching Grafana annotations for test {test.name}...")
         else:
-            logging.info(f"Fetching Grafana annotations...")
+            logging.info("Fetching Grafana annotations...")
         tags_to_query = {"hunter", "change-point"}
         if test:
-            tags_to_query.add("test:" + test.name)
+            tags_to_query.add(f"test: {test.name}")
         annotations = grafana.fetch_annotations(None, None, list(tags_to_query))
         if not annotations:
             logging.info("No annotations found.")
@@ -378,7 +379,7 @@ def setup_data_selector_parser(parser: argparse.ArgumentParser):
         type=int,
         metavar="COUNT",
         dest="last_n_points",
-        help="the number of data points to take from the end of the series"
+        help="the number of data points to take from the end of the series",
     )
 
 
@@ -492,6 +493,14 @@ def main():
         metavar="DATE",
         dest="cph_report_since",
     )
+    analyze_parser.add_argument(
+        "--output",
+        help="Output format for the generated report.",
+        choices=list(ReportType),
+        dest="report_type",
+        default=ReportType.LOG,
+        type=ReportType,
+    )
     setup_data_selector_parser(analyze_parser)
     setup_analysis_options_parser(analyze_parser)
 
@@ -510,8 +519,9 @@ def main():
         "--force", help="don't ask questions, just do it", dest="force", action="store_true"
     )
 
-    validate_parser = subparsers.add_parser("validate",
-                                            help="validates the tests and metrics defined in the configuration")
+    subparsers.add_parser(
+        "validate", help="validates the tests and metrics defined in the configuration"
+    )
 
     try:
         args = parser.parse_args()
@@ -535,14 +545,17 @@ def main():
             slack_cph_since = parse_datetime(args.cph_report_since)
             data_selector = data_selector_from_args(args)
             options = analysis_options_from_args(args)
+            report_type = args.report_type
             tests = hunter.get_tests(*args.tests)
             tests_analyzed_series = {test.name: None for test in tests}
             for test in tests:
                 try:
-                    analyzed_series = hunter.analyze(test, selector=data_selector, options=options)
+                    analyzed_series = hunter.analyze(
+                        test, selector=data_selector, options=options, report_type=report_type
+                    )
                     if update_grafana_flag:
                         if not isinstance(test, GraphiteTestConfig):
-                            raise GrafanaError(f"Not a Graphite test")
+                            raise GrafanaError("Not a Graphite test")
                         hunter.update_grafana_annotations(test, analyzed_series)
                     if slack_notification_channels:
                         tests_analyzed_series[test.name] = analyzed_series
@@ -568,9 +581,7 @@ def main():
             errors = 0
             for test in tests:
                 try:
-                    regressions = hunter.regressions(
-                        test, selector=data_selector, options=options
-                    )
+                    regressions = hunter.regressions(test, selector=data_selector, options=options)
                     if regressions:
                         regressing_test_count += 1
                 except HunterError as err:
@@ -586,7 +597,7 @@ def main():
             else:
                 print(f"Regressions in {regressing_test_count} tests found")
             if errors > 0:
-                print(f"Some tests were skipped due to import / analyze errors. Consult error log.")
+                print("Some tests were skipped due to import / analyze errors. Consult error log.")
 
         if args.command == "remove-annotations":
             if args.tests:
diff --git a/hunter/report.py b/hunter/report.py
index 5bbb4d88..58a84b0a 100644
--- a/hunter/report.py
+++ b/hunter/report.py
@@ -1,12 +1,22 @@
 from collections import OrderedDict
+from enum import Enum, unique
 from typing import List
 
 from tabulate import tabulate
 
-from hunter.series import Series, ChangePoint, ChangePointGroup
+from hunter.series import Series, ChangePointGroup
 from hunter.util import format_timestamp, insert_multiple, remove_common_prefix
 
 
+@unique
+class ReportType(Enum):
+    LOG = "log"
+    JSON = "json"
+
+    def __str__(self):
+        return self.value
+
+
 class Report:
     __series: Series
     __change_points: List[ChangePointGroup]
@@ -19,7 +29,17 @@ def __init__(self, series: Series, change_points: List[ChangePointGroup]):
     def __column_widths(log: List[str]) -> List[int]:
         return [len(c) for c in log[1].split(None)]
 
-    def format_log(self) -> str:
+    def produce_report(self, test_name: str, report_type: ReportType):
+        if report_type == ReportType.LOG:
+            return self.__format_log_annotated(test_name)
+        elif report_type == ReportType.JSON:
+            return self.__format_json(test_name)
+        else:
+            from hunter.main import HunterError
+
+            raise HunterError(f"Unknown report type: {report_type}")
+
+    def __format_log(self) -> str:
         time_column = [format_timestamp(ts) for ts in self.__series.time]
         table = {"time": time_column, **self.__series.attributes, **self.__series.data}
         metrics = list(self.__series.data.keys())
@@ -30,9 +50,9 @@ def format_log(self) -> str:
         )
         return tabulate(table, headers=headers)
 
-    def format_log_annotated(self) -> str:
+    def __format_log_annotated(self, test_name: str) -> str:
         """Returns test log with change points marked as horizontal lines"""
-        lines = self.format_log().split("\n")
+        lines = self.__format_log().split("\n")
         col_widths = self.__column_widths(lines)
         indexes = [cp.index for cp in self.__change_points]
         separators = []
@@ -58,3 +78,8 @@ def format_log_annotated(self) -> str:
 
         lines = lines[:2] + insert_multiple(lines[2:], separators, indexes)
         return "\n".join(lines)
+
+    def __format_json(self, test_name: str) -> str:
+        import json
+
+        return json.dumps({test_name: [cpg.to_json() for cpg in self.__change_points]})
diff --git a/hunter/series.py b/hunter/series.py
index be885bf2..5ad0279e 100644
--- a/hunter/series.py
+++ b/hunter/series.py
@@ -2,7 +2,9 @@
 from dataclasses import dataclass
 from datetime import datetime
 from itertools import groupby
-from typing import Dict, List, Optional, Iterable, OrderedDict
+from typing import Dict, List, Optional, Iterable
+
+import numpy as np
 
 from hunter.analysis import (
     fill_missing,
@@ -11,8 +13,6 @@
     TTestSignificanceTester,
 )
 
-import numpy as np
-
 
 @dataclass
 class AnalysisOptions:
@@ -56,6 +56,12 @@ def backward_change_percent(self) -> float:
     def magnitude(self):
         return self.stats.change_magnitude()
 
+    def to_json(self):
+        return {
+            "metric": self.metric,
+            "forward_change_percent": f"{self.forward_change_percent():.0f}",
+        }
+
 
 @dataclass
 class ChangePointGroup:
@@ -68,6 +74,9 @@ class ChangePointGroup:
     prev_attributes: Dict[str, str]
     changes: List[ChangePoint]
 
+    def to_json(self):
+        return {"time": self.time, "changes": [cp.to_json() for cp in self.changes]}
+
 
 class Series:
     """
@@ -115,7 +124,7 @@ def find_first_not_earlier_than(self, time: datetime) -> Optional[int]:
         return None
 
     def find_by_attribute(self, name: str, value: str) -> List[int]:
-        """ Returns the indexes of data points with given attribute value """
+        """Returns the indexes of data points with given attribute value"""
         result = []
         for i in range(len(self.time)):
             if self.attributes_at(i).get(name) == value:
diff --git a/hunter/slack.py b/hunter/slack.py
index a454823a..695395eb 100644
--- a/hunter/slack.py
+++ b/hunter/slack.py
@@ -3,8 +3,8 @@
 from math import isinf
 from typing import Dict, List
 
-from slack_sdk import WebClient
 from pytz import UTC
+from slack_sdk import WebClient
 
 from hunter.data_selector import DataSelector
 from hunter.series import ChangePointGroup, AnalyzedSeries
@@ -139,6 +139,7 @@ def __text_block(cls, type, text_type, text):
     def __fields_section(cls, fields_text):
         def field_block(text):
             return {"type": "mrkdwn", "text": text}
+
         return cls.__block("section", content={"fields": [field_block(t) for t in fields_text]})
 
     @classmethod
diff --git a/hunter/test_config.py b/hunter/test_config.py
index 0e6145fb..46a721bf 100644
--- a/hunter/test_config.py
+++ b/hunter/test_config.py
@@ -1,7 +1,6 @@
-import collections
-from abc import abstractmethod
+import os.path
 from dataclasses import dataclass
-from typing import Dict, List, Set, Optional
+from typing import Dict, List, Optional
 
 from hunter.csv_options import CsvOptions
 from hunter.util import interpolate
@@ -110,6 +109,18 @@ def get_path(self, branch_name: Optional[str], metric_name: str) -> str:
     def fully_qualified_metric_names(self):
         return [f"{self.prefix}.{m.suffix}" for _, m in self.metrics.items()]
 
+
+@dataclass
+class HistoStatTestConfig(TestConfig):
+    name: str
+    file: str
+
+    def fully_qualified_metric_names(self):
+        from hunter.importer import HistoStatImporter
+
+        return HistoStatImporter().fetch_all_metric_names(self)
+
+
 def create_test_config(name: str, config: Dict) -> TestConfig:
     """
     Loads properties of a test from a dictionary read from hunter's config file
@@ -122,6 +133,8 @@ def create_test_config(name: str, config: Dict) -> TestConfig:
         return create_csv_test_config(name, config)
     elif test_type == "graphite":
         return create_graphite_test_config(name, config)
+    elif test_type == "histostat":
+        return create_histostat_test_config(name, config)
     elif test_type is None:
         raise TestConfigError(f"Test type not set for test {name}")
     else:
@@ -201,3 +214,15 @@ def create_graphite_test_config(name: str, test_info: Dict) -> GraphiteTestConfi
         annotate=test_info.get("annotate", []),
         metrics=metrics,
     )
+
+
+def create_histostat_test_config(name: str, test_info: Dict) -> HistoStatTestConfig:
+    try:
+        file = test_info["file"]
+    except KeyError as e:
+        raise TestConfigError(f"Configuration key not found in test {name}: {e.args[0]}")
+    if not os.path.exists(file):
+        raise TestConfigError(
+            f"Configuration referenced histostat file which does not exist: {file}"
+        )
+    return HistoStatTestConfig(name, file)
diff --git a/poetry.lock b/poetry.lock
index d763ee93..58326467 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,11 +1,3 @@
-[[package]]
-name = "appdirs"
-version = "1.4.4"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "main"
-optional = false
-python-versions = "*"
-
 [[package]]
 name = "atomicwrites"
 version = "1.4.0"
@@ -16,75 +8,92 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "attrs"
-version = "20.3.0"
+version = "21.4.0"
 description = "Classes Without Boilerplate"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "cloudpickle"]
+
+[[package]]
+name = "backports.zoneinfo"
+version = "0.2.1"
+description = "Backport of the standard library zoneinfo module"
+category = "main"
+optional = false
+python-versions = ">=3.6"
 
 [package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
-docs = ["furo", "sphinx", "zope.interface"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
+tzdata = ["tzdata"]
 
 [[package]]
 name = "black"
-version = "20.8b1"
+version = "22.3.0"
 description = "The uncompromising code formatter."
 category = "main"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.6.2"
 
 [package.dependencies]
-appdirs = "*"
-click = ">=7.1.2"
+click = ">=8.0.0"
 mypy-extensions = ">=0.4.3"
-pathspec = ">=0.6,<1"
-regex = ">=2020.1.8"
-toml = ">=0.10.1"
-typed-ast = ">=1.4.0"
-typing-extensions = ">=3.7.4"
+pathspec = ">=0.9.0"
+platformdirs = ">=2"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
+typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
 colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
+d = ["aiohttp (>=3.7.4)"]
+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
+uvloop = ["uvloop (>=0.15.2)"]
 
 [[package]]
 name = "certifi"
-version = "2020.12.5"
+version = "2021.10.8"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "main"
 optional = false
 python-versions = "*"
 
 [[package]]
-name = "chardet"
-version = "4.0.0"
-description = "Universal encoding detector for Python 2 and 3"
+name = "charset-normalizer"
+version = "2.0.12"
+description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.5.0"
+
+[package.extras]
+unicode_backport = ["unicodedata2"]
 
 [[package]]
 name = "click"
-version = "7.1.2"
+version = "8.1.2"
 description = "Composable command line interface toolkit"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.7"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
 
 [[package]]
 name = "colorama"
 version = "0.4.4"
 description = "Cross-platform colored terminal text."
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "dateparser"
-version = "1.0.0"
+version = "1.1.1"
 description = "Date parsing library designed to parse dates from HTML pages"
 category = "main"
 optional = false
@@ -93,15 +102,17 @@ python-versions = ">=3.5"
 [package.dependencies]
 python-dateutil = "*"
 pytz = "*"
-regex = "!=2019.02.19"
+regex = "<2019.02.19 || >2019.02.19,<2021.8.27 || >2021.8.27,<2022.3.15"
 tzlocal = "*"
 
 [package.extras]
 calendars = ["convertdate", "hijri-converter", "convertdate"]
+fasttext = ["fasttext"]
+langdetect = ["langdetect"]
 
 [[package]]
 name = "decorator"
-version = "5.0.7"
+version = "5.1.1"
 description = "Decorators for Humans"
 category = "main"
 optional = false
@@ -117,11 +128,11 @@ python-versions = "*"
 
 [[package]]
 name = "idna"
-version = "2.10"
+version = "3.3"
 description = "Internationalized Domain Names in Applications (IDNA)"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.5"
 
 [[package]]
 name = "iniconfig"
@@ -133,7 +144,7 @@ python-versions = "*"
 
 [[package]]
 name = "more-itertools"
-version = "8.7.0"
+version = "8.12.0"
 description = "More routines for operating on iterables, beyond itertools"
 category = "main"
 optional = false
@@ -157,61 +168,81 @@ python-versions = ">=3.6"
 
 [[package]]
 name = "packaging"
-version = "20.9"
+version = "21.3"
 description = "Core utilities for Python packages"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-pyparsing = ">=2.0.2"
+pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
 
 [[package]]
 name = "pathspec"
-version = "0.8.1"
+version = "0.9.0"
 description = "Utility library for gitignore style pattern matching of file paths."
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+
+[[package]]
+name = "platformdirs"
+version = "2.5.2"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)", "sphinx (>=4)"]
+test = ["appdirs (==1.4.4)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)", "pytest (>=6)"]
 
 [[package]]
 name = "pluggy"
-version = "0.13.1"
+version = "1.0.0"
 description = "plugin and hook calling mechanisms for python"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.6"
 
 [package.extras]
 dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "py"
-version = "1.10.0"
+version = "1.11.0"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "pyparsing"
-version = "2.4.7"
-description = "Python parsing module"
+version = "3.0.8"
+description = "pyparsing module - Classes and methods to define and execute parsing grammars"
 category = "dev"
 optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+python-versions = ">=3.6.8"
+
+[package.extras]
+diagrams = ["railroad-diagrams", "jinja2"]
 
 [[package]]
 name = "pystache"
-version = "0.5.4"
+version = "0.6.0"
 description = "Mustache for Python"
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=3.6"
+
+[package.extras]
+cov = ["coverage", "coverage-python-version"]
+test = ["nose"]
 
 [[package]]
 name = "pytest"
-version = "6.2.3"
+version = "6.2.5"
 description = "pytest: simple powerful testing with Python"
 category = "dev"
 optional = false
@@ -223,7 +254,7 @@ attrs = ">=19.2.0"
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
 iniconfig = "*"
 packaging = "*"
-pluggy = ">=0.12,<1.0.0a1"
+pluggy = ">=0.12,<2.0"
 py = ">=1.8.2"
 toml = "*"
 
@@ -232,7 +263,7 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "python-dateutil"
-version = "2.8.1"
+version = "2.8.2"
 description = "Extensions to the standard Python datetime module"
 category = "main"
 optional = false
@@ -249,44 +280,67 @@ category = "main"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "pytz-deprecation-shim"
+version = "0.1.0.post0"
+description = "Shims to make deprecation of pytz easier"
+category = "main"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,>=2.7"
+
+[package.dependencies]
+"backports.zoneinfo" = {version = "*", markers = "python_version >= \"3.6\" and python_version < \"3.9\""}
+tzdata = {version = "*", markers = "python_version >= \"3.6\""}
+
 [[package]]
 name = "regex"
-version = "2021.4.4"
+version = "2022.3.2"
 description = "Alternative regular expression module, to replace re."
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=3.6"
 
 [[package]]
 name = "requests"
-version = "2.25.1"
+version = "2.27.1"
 description = "Python HTTP for Humans."
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
 
 [package.dependencies]
 certifi = ">=2017.4.17"
-chardet = ">=3.0.2,<5"
-idna = ">=2.5,<3"
+charset-normalizer = {version = ">=2.0.0,<2.1.0", markers = "python_version >= \"3\""}
+idna = {version = ">=2.5,<4", markers = "python_version >= \"3\""}
 urllib3 = ">=1.21.1,<1.27"
 
 [package.extras]
-security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
 socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
+use_chardet_on_py3 = ["chardet (>=3.0.2,<5)"]
 
 [[package]]
 name = "ruamel.yaml"
-version = "0.15.89"
+version = "0.17.21"
 description = "ruamel.yaml is a YAML parser/emitter that supports roundtrip preservation of comments, seq/map flow style, and map key order"
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=3"
+
+[package.dependencies]
+"ruamel.yaml.clib" = {version = ">=0.2.6", markers = "platform_python_implementation == \"CPython\" and python_version < \"3.11\""}
 
 [package.extras]
 docs = ["ryd"]
 jinja2 = ["ruamel.yaml.jinja2 (>=0.2)"]
 
+[[package]]
+name = "ruamel.yaml.clib"
+version = "0.2.6"
+description = "C version of reader, parser and emitter for ruamel.yaml derived from libyaml"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
 [[package]]
 name = "scipy"
 version = "1.6.1"
@@ -315,7 +369,7 @@ typing-extensions = ">=3.7.4,<4.0.0"
 
 [[package]]
 name = "six"
-version = "1.15.0"
+version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
 category = "main"
 optional = false
@@ -323,15 +377,15 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "slack-sdk"
-version = "3.4.2"
+version = "3.15.2"
 description = "The Slack API Platform SDK for Python"
 category = "main"
 optional = false
 python-versions = ">=3.6.0"
 
 [package.extras]
-optional = ["aiodns (>1.0)", "aiohttp (>=3.7.3,<4)", "boto3 (<=2)", "SQLAlchemy (>=1,<2)", "websockets (>=8,<9)", "websocket-client (>=0.57)"]
-testing = ["pytest (>=5.4,<6)", "pytest-asyncio (<1)", "Flask-Sockets (>=0.2,<1)", "pytest-cov (>=2,<3)", "codecov (>=2,<3)", "flake8 (>=3,<4)", "black (==20.8b1)", "psutil (>=5,<6)", "databases (>=0.3)"]
+optional = ["aiodns (>1.0)", "aiohttp (>=3.7.3,<4)", "boto3 (<=2)", "SQLAlchemy (>=1,<2)", "websockets (>=10,<11)", "websocket-client (>=1,<2)"]
+testing = ["pytest (>=6.2.5,<7)", "pytest-asyncio (<1)", "Flask-Sockets (>=0.2,<1)", "Flask (>=1,<2)", "Werkzeug (<2)", "itsdangerous (==2.0.1)", "pytest-cov (>=2,<3)", "codecov (>=2,<3)", "flake8 (>=4,<5)", "black (==22.1.0)", "psutil (>=5,<6)", "databases (>=0.5)", "boto3 (<=2)", "moto (>=3,<4)"]
 
 [[package]]
 name = "structlog"
@@ -365,49 +419,63 @@ widechars = ["wcwidth"]
 name = "toml"
 version = "0.10.2"
 description = "Python Library for Tom's Obvious, Minimal Language"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
-name = "typed-ast"
-version = "1.4.3"
-description = "a fork of Python 2 and 3 ast modules with type comment support"
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=3.7"
 
 [[package]]
 name = "typing-extensions"
-version = "3.7.4.3"
+version = "3.10.0.2"
 description = "Backported and Experimental Type Hints for Python 3.5+"
 category = "main"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "tzdata"
+version = "2022.1"
+description = "Provider of IANA time zone data"
+category = "main"
+optional = false
+python-versions = ">=2"
+
 [[package]]
 name = "tzlocal"
-version = "2.1"
+version = "4.2"
 description = "tzinfo object for the local timezone"
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-pytz = "*"
+"backports.zoneinfo" = {version = "*", markers = "python_version < \"3.9\""}
+pytz-deprecation-shim = "*"
+tzdata = {version = "*", markers = "platform_system == \"Windows\""}
+
+[package.extras]
+devenv = ["black", "pyroma", "pytest-cov", "zest.releaser"]
+test = ["pytest-mock (>=3.3)", "pytest (>=4.3)"]
 
 [[package]]
 name = "urllib3"
-version = "1.26.4"
+version = "1.26.9"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.extras]
+brotli = ["brotlicffi (>=0.8.0)", "brotli (>=1.0.9)", "brotlipy (>=0.6.0)"]
 secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
-brotli = ["brotlipy (>=0.6.0)"]
 
 [[package]]
 name = "validators"
@@ -427,63 +495,99 @@ test = ["pytest (>=2.2.3)", "flake8 (>=2.4.0)", "isort (>=4.2.2)"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "684058ad65a4dfc344038d68e3f07d5f06313747c369547543b9e8e65acb9732"
+content-hash = "bbd96ec5ca0f566795f5603ec877c05faaadf87131a847c38d2c77697b260d10"
 
 [metadata.files]
-appdirs = [
-    {file = "appdirs-1.4.4-py2.py3-none-any.whl", hash = "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"},
-    {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
-]
 atomicwrites = [
     {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},
     {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},
 ]
 attrs = [
-    {file = "attrs-20.3.0-py2.py3-none-any.whl", hash = "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6"},
-    {file = "attrs-20.3.0.tar.gz", hash = "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"},
+    {file = "attrs-21.4.0-py2.py3-none-any.whl", hash = "sha256:2d27e3784d7a565d36ab851fe94887c5eccd6a463168875832a1be79c82828b4"},
+    {file = "attrs-21.4.0.tar.gz", hash = "sha256:626ba8234211db98e869df76230a137c4c40a12d72445c45d5f5b716f076e2fd"},
+]
+"backports.zoneinfo" = [
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-    {file = "typed_ast-1.4.3-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:cae53c389825d3b46fb37538441f75d6aecc4174f615d048321b716df2757fb0"},
-    {file = "typed_ast-1.4.3-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:b9574c6f03f685070d859e75c7f9eeca02d6933273b5e69572e5ff9d5e3931c3"},
-    {file = "typed_ast-1.4.3-cp39-cp39-win32.whl", hash = "sha256:209596a4ec71d990d71d5e0d312ac935d86930e6eecff6ccc7007fe54d703808"},
-    {file = "typed_ast-1.4.3-cp39-cp39-win_amd64.whl", hash = "sha256:9c6d1a54552b5330bc657b7ef0eae25d00ba7ffe85d9ea8ae6540d2197a3788c"},
-    {file = "typed_ast-1.4.3.tar.gz", hash = "sha256:fb1bbeac803adea29cedd70781399c99138358c26d05fcbd23c13016b7f5ec65"},
+tomli = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
 ]
 typing-extensions = [
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-    {file = "typing_extensions-3.7.4.3-py3-none-any.whl", hash = "sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918"},
-    {file = "typing_extensions-3.7.4.3.tar.gz", hash = "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c"},
+    {file = "typing_extensions-3.10.0.2-py2-none-any.whl", hash = "sha256:d8226d10bc02a29bcc81df19a26e56a9647f8b0a6d4a83924139f4a8b01f17b7"},
+    {file = "typing_extensions-3.10.0.2-py3-none-any.whl", hash = "sha256:f1d25edafde516b146ecd0613dabcc61409817af4766fbbcfb8d1ad4ec441a34"},
+    {file = "typing_extensions-3.10.0.2.tar.gz", hash = "sha256:49f75d16ff11f1cd258e1b988ccff82a3ca5570217d7ad8c5f48205dd99a677e"},
+]
+tzdata = [
+    {file = "tzdata-2022.1-py2.py3-none-any.whl", hash = "sha256:238e70234214138ed7b4e8a0fab0e5e13872edab3be586ab8198c407620e2ab9"},
+    {file = "tzdata-2022.1.tar.gz", hash = "sha256:8b536a8ec63dc0751342b3984193a3118f8fca2afe25752bb9b7fffd398552d3"},
 ]
 tzlocal = [
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-    {file = "tzlocal-2.1.tar.gz", hash = "sha256:643c97c5294aedc737780a49d9df30889321cbe1204eac2c2ec6134035a92e44"},
+    {file = "tzlocal-4.2-py3-none-any.whl", hash = "sha256:89885494684c929d9191c57aa27502afc87a579be5cdd3225c77c463ea043745"},
+    {file = "tzlocal-4.2.tar.gz", hash = "sha256:ee5842fa3a795f023514ac2d801c4a81d1743bbe642e3940143326b3a00addd7"},
 ]
 urllib3 = [
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-    {file = "urllib3-1.26.4.tar.gz", hash = "sha256:e7b021f7241115872f92f43c6508082facffbd1c048e3c6e2bb9c2a157e28937"},
+    {file = "urllib3-1.26.9-py2.py3-none-any.whl", hash = "sha256:44ece4d53fb1706f667c9bd1c648f5469a2ec925fcf3a776667042d645472c14"},
+    {file = "urllib3-1.26.9.tar.gz", hash = "sha256:aabaf16477806a5e1dd19aa41f8c2b7950dd3c746362d7e3223dbe6de6ac448e"},
 ]
 validators = [
     {file = "validators-0.18.2-py3-none-any.whl", hash = "sha256:0143dcca8a386498edaf5780cbd5960da1a4c85e0719f3ee5c9b41249c4fefbd"},
diff --git a/pyproject.toml b/pyproject.toml
index 92e5f082..7125d2a3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,11 +11,11 @@ numpy = "1.19"
 python = "^3.8"
 python-dateutil = "^2.8.1"
 signal-processing-algorithms = "^1.3.2"
-"ruamel.yaml" = "=0.15.89"
+"ruamel.yaml" = "=0.17.21"
 requests = "^2.25.1"
-pystache = "^0.5.4"
+pystache = "^0.6.0"
 tabulate = "^0.8.7"
-black = "^20.8b1"
+black = "^22.3.0"
 validators = "^0.18.2"
 slack-sdk = "^3.4.2"
 
diff --git a/tests/config_test.py b/tests/config_test.py
index 79d093c0..dbf260f6 100644
--- a/tests/config_test.py
+++ b/tests/config_test.py
@@ -1,7 +1,7 @@
 from pathlib import Path
 
 from hunter.config import load_config_from
-from hunter.test_config import GraphiteTestConfig, CsvTestConfig
+from hunter.test_config import GraphiteTestConfig, CsvTestConfig, HistoStatTestConfig
 
 
 def test_load_graphite_tests():
@@ -47,3 +47,13 @@ def test_load_test_groups():
     groups = config.test_groups
     assert len(groups) == 2
     assert len(groups["remote"]) == 2
+
+
+def test_load_histostat_config():
+    config = load_config_from(Path("tests/resources/histostat_test_config.yaml"))
+    tests = config.tests
+    assert len(tests) == 1
+    test = tests["histostat-sample"]
+    assert isinstance(test, HistoStatTestConfig)
+    # 14 tags * 12 tag_metrics == 168 unique metrics
+    assert len(test.fully_qualified_metric_names()) == 168
diff --git a/tests/importer_test.py b/tests/importer_test.py
index a0e74bfb..676f4e8b 100644
--- a/tests/importer_test.py
+++ b/tests/importer_test.py
@@ -4,21 +4,33 @@
 
 from hunter.csv_options import CsvOptions
 from hunter.graphite import DataSelector
-from hunter.importer import CsvImporter
-from hunter.test_config import CsvTestConfig, CsvMetric
+from hunter.importer import CsvImporter, HistoStatImporter
+from hunter.test_config import CsvTestConfig, CsvMetric, HistoStatTestConfig
 
+SAMPLE_CSV = "tests/resources/sample.csv"
 
-def test_import_csv():
-    test = CsvTestConfig(
+
+def csv_test_config(file, csv_options=None):
+    return CsvTestConfig(
         name="test",
-        file="tests/resources/sample.csv",
-        csv_options=CsvOptions(),
+        file=file,
+        csv_options=csv_options if csv_options else CsvOptions(),
         time_column="time",
         metrics=[CsvMetric("m1", 1, 1.0, "metric1"), CsvMetric("m2", 1, 5.0, "metric2")],
         attributes=["commit"],
     )
+
+
+def data_selector():
+    selector = DataSelector()
+    selector.since_time = datetime(1970, 1, 1, 1, 1, 1, tzinfo=pytz.UTC)
+    return selector
+
+
+def test_import_csv():
+    test = csv_test_config(SAMPLE_CSV)
     importer = CsvImporter()
-    series = importer.fetch_data(test_conf=test)
+    series = importer.fetch_data(test_conf=test, selector=data_selector())
     assert len(series.data.keys()) == 2
     assert len(series.time) == 10
     assert len(series.data["m1"]) == 10
@@ -27,16 +39,9 @@ def test_import_csv():
 
 
 def test_import_csv_with_metrics_filter():
-    test = CsvTestConfig(
-        name="test",
-        file="tests/resources/sample.csv",
-        csv_options=CsvOptions(),
-        time_column="time",
-        metrics=[CsvMetric("m1", 1, 1.0, "metric1"), CsvMetric("m2", 1, 5.0, "metric2")],
-        attributes=["commit"],
-    )
+    test = csv_test_config(SAMPLE_CSV)
     importer = CsvImporter()
-    selector = DataSelector()
+    selector = data_selector()
     selector.metrics = ["m2"]
     series = importer.fetch_data(test, selector=selector)
     assert len(series.data.keys()) == 1
@@ -46,17 +51,9 @@ def test_import_csv_with_metrics_filter():
 
 
 def test_import_csv_with_time_filter():
-    test = CsvTestConfig(
-        name="test",
-        file="tests/resources/sample.csv",
-        csv_options=CsvOptions(),
-        time_column="time",
-        metrics=[CsvMetric("m1", 1, 1.0, "metric1"), CsvMetric("m2", 1, 5.0, "metric2")],
-        attributes=["commit"],
-    )
-
+    test = csv_test_config(SAMPLE_CSV)
     importer = CsvImporter()
-    selector = DataSelector()
+    selector = data_selector()
     tz = pytz.timezone("Etc/GMT+1")
     selector.since_time = datetime(2021, 1, 5, 0, 0, 0, tzinfo=tz)
     selector.until_time = datetime(2021, 1, 7, 0, 0, 0, tzinfo=tz)
@@ -68,17 +65,9 @@ def test_import_csv_with_time_filter():
 
 
 def test_import_csv_with_unix_timestamps():
-    test = CsvTestConfig(
-        name="test",
-        file="tests/resources/sample.csv",
-        csv_options=CsvOptions(),
-        time_column="time",
-        metrics=[CsvMetric("m1", 1, 1.0, "metric1"), CsvMetric("m2", 1, 5.0, "metric2")],
-        attributes=["commit"],
-    )
-
+    test = csv_test_config(SAMPLE_CSV)
     importer = CsvImporter()
-    series = importer.fetch_data(test_conf=test)
+    series = importer.fetch_data(test_conf=test, selector=data_selector())
     assert len(series.data.keys()) == 2
     assert len(series.time) == 10
     assert len(series.data["m1"]) == 10
@@ -90,18 +79,9 @@ def test_import_csv_with_unix_timestamps():
 def test_import_csv_semicolon_sep():
     options = CsvOptions()
     options.delimiter = ";"
-
-    test = CsvTestConfig(
-        name="test",
-        file="tests/resources/sample-semicolons.csv",
-        csv_options=options,
-        time_column="time",
-        metrics=[CsvMetric("m1", 1, 1.0, "metric1"), CsvMetric("m2", 1, 5.0, "metric2")],
-        attributes=["commit"],
-    )
-
+    test = csv_test_config("tests/resources/sample-semicolons.csv", options)
     importer = CsvImporter()
-    series = importer.fetch_data(test_conf=test)
+    series = importer.fetch_data(test_conf=test, selector=data_selector())
     assert len(series.data.keys()) == 2
     assert len(series.time) == 10
     assert len(series.data["m1"]) == 10
@@ -110,18 +90,29 @@ def test_import_csv_semicolon_sep():
 
 
 def test_import_csv_last_n_points():
-    test = CsvTestConfig(
-        name="test",
-        file="tests/resources/sample.csv",
-        csv_options=CsvOptions(),
-        time_column="time",
-        metrics=[CsvMetric("m1", 1, 1.0, "metric1"), CsvMetric("m2", 1, 5.0, "metric2")],
-        attributes=["commit"],
-    )
+    test = csv_test_config(SAMPLE_CSV)
     importer = CsvImporter()
-    selector = DataSelector()
+    selector = data_selector()
     selector.last_n_points = 5
     series = importer.fetch_data(test, selector=selector)
     assert len(series.time) == 5
     assert len(series.data["m2"]) == 5
     assert len(series.attributes["commit"]) == 5
+
+
+def test_import_histostat():
+    test = HistoStatTestConfig(name="test", file="tests/resources/histostat.csv")
+    importer = HistoStatImporter()
+    series = importer.fetch_data(test)
+    assert len(series.time) == 3
+    assert len(series.data["initialize.result-success.count"]) == 3
+
+
+def test_import_histostat_last_n_points():
+    test = HistoStatTestConfig(name="test", file="tests/resources/histostat.csv")
+    importer = HistoStatImporter()
+    selector = DataSelector()
+    selector.last_n_points = 2
+    series = importer.fetch_data(test, selector=selector)
+    assert len(series.time) == 2
+    assert len(series.data["initialize.result-success.count"]) == 2
diff --git a/tests/report_test.py b/tests/report_test.py
index c63894ce..fe15a9c7 100644
--- a/tests/report_test.py
+++ b/tests/report_test.py
@@ -1,12 +1,17 @@
+import json
+
+import pytest
+
+from hunter.report import Report, ReportType
 from hunter.series import Series, Metric
-from hunter.report import Report
 
 
-def test_report():
+@pytest.fixture(scope="module")
+def series():
     series1 = [1.02, 0.95, 0.99, 1.00, 1.12, 0.90, 0.50, 0.51, 0.48, 0.48, 0.55]
     series2 = [2.02, 2.03, 2.01, 2.04, 1.82, 1.85, 1.79, 1.81, 1.80, 1.76, 1.78]
     time = list(range(len(series1)))
-    test = Series(
+    return Series(
         "test",
         branch=None,
         time=time,
@@ -14,18 +19,44 @@ def test_report():
         data={"series1": series1, "series2": series2},
         attributes={},
     )
-    changepoints = test.analyze().change_points_by_time
-    report = Report(test, changepoints)
-    output = report.format_log_annotated()
+
+
+@pytest.fixture(scope="module")
+def change_points(series):
+    return series.analyze().change_points_by_time
+
+
+@pytest.fixture(scope="module")
+def report(series, change_points):
+    return Report(series, change_points)
+
+
+def test_report(series, change_points):
+    report = Report(series, change_points)
+    output = report.produce_report("test", ReportType.LOG)
     assert "series1" in output
     assert "series2" in output
     assert "1.02" in output
     assert "0.55" in output
     assert "2.02" in output
     assert "1.78" in output
-    assert "%" in output
+    assert "-11.0%" in output
+    assert "-49.4%" in output
 
     # 2 lines for the header
     # 1 line per each time point
     # 3 lines per each change point
-    assert len(output.split("\n")) == len(time) + 2 + 3 * len(changepoints)
+    assert len(output.split("\n")) == len(series.time) + 2 + 3 * len(change_points)
+
+
+def test_json_report(report):
+    output = report.produce_report("test_name_from_config", ReportType.JSON)
+    obj = json.loads(output)
+    expected = {
+        "test_name_from_config": [
+            {"time": 4, "changes": [{"metric": "series2", "forward_change_percent": "-11"}]},
+            {"time": 6, "changes": [{"metric": "series1", "forward_change_percent": "-49"}]},
+        ]
+    }
+    assert isinstance(obj, dict)
+    assert obj == expected
diff --git a/tests/resources/histostat.csv b/tests/resources/histostat.csv
new file mode 100644
index 00000000..b7516714
--- /dev/null
+++ b/tests/resources/histostat.csv
@@ -0,0 +1,47 @@
+#logging stats for session scenario_20220407_172524_360
+#[Histogram log format version 1.0]
+#[StartTime: 1649352325.178 (seconds since epoch), Thu Apr 07 17:25:25 UTC 2022]
+#[TimeUnit: NANOSECONDS]
+#Tag,Interval_Start,Interval_Length,count,min,p25,p50,p75,p90,p95,p98,p99,p999,p9999,max
+Tag=initialize.tokenfiller,2.616,2.385,2028,1012224,1061887,1068031,1073151,1170431,1351679,2258943,4001791,10575871,15114239,15114239
+Tag=initialize.retry-delay,3.434,1.621,0,0,0,0,0,0,0,0,0,0,0,0
+Tag=initialize.pages,3.435,1.621,0,0,0,0,0,0,0,0,0,0,0,0
+Tag=initialize.skipped-tokens,3.437,1.620,0,0,0,0,0,0,0,0,0,0,0,0
+Tag=initialize.resultset-size,3.438,1.620,6785,0,0,0,0,0,0,0,0,0,0,0
+Tag=initialize.read_input,3.491,1.567,727,946,2217,2577,3001,4579,45055,49503,53055,161919,161919,161919
+Tag=initialize.strides.servicetime,3.495,1.567,8,1106247680,1135607807,1327497215,1394606079,1546649599,1546649599,1546649599,1546649599,1546649599,1546649599,1546649599
+Tag=initialize.bind,3.496,1.579,7606,26128,59391,74303,89599,113151,141183,213887,269567,10944511,12255231,12255231
+Tag=initialize.execute,3.497,1.585,7616,10528,32447,40927,57279,113535,135039,153343,174207,1992703,9560063,9560063
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diff --git a/tests/resources/histostat_test_config.yaml b/tests/resources/histostat_test_config.yaml
new file mode 100644
index 00000000..2112ce72
--- /dev/null
+++ b/tests/resources/histostat_test_config.yaml
@@ -0,0 +1,4 @@
+tests:
+  histostat-sample:
+    type: histostat
+    file: tests/resources/histostat.csv
diff --git a/tests/slack_notification_test.py b/tests/slack_notification_test.py
index 175d3ab8..a224c2d6 100644
--- a/tests/slack_notification_test.py
+++ b/tests/slack_notification_test.py
@@ -1,21 +1,20 @@
 import json
-
 from datetime import datetime
-from dateutil import tz
 from typing import Dict, List
 
+from dateutil import tz
+
 from hunter.data_selector import DataSelector
 from hunter.series import Series, Metric
 from hunter.slack import SlackNotifier, NotificationError
 
-
 NOTIFICATION_CHANNELS = ["a-channel", "b-channel"]
 
 
 class DispatchTrackingMockClient:
     dispatches: Dict[str, List[List[object]]] = dict()
 
-    def chat_postMessage(self, channel: str=None, blocks: List[object]=None):
+    def chat_postMessage(self, channel: str = None, blocks: List[object] = None):
         if not channel or not blocks:
             raise NotificationError(f"Invalid dispatch: {channel} {blocks}")
         if channel not in self.dispatches:
@@ -76,10 +75,12 @@ def test_blocks_dispatch():
     analyzed_series = test.analyze()
     mock_client = DispatchTrackingMockClient()
     notifier = SlackNotifier(client=mock_client)
-    notifier.notify(test_analyzed_series={"test": analyzed_series},
-                    selector=data_selector,
-                    channels=NOTIFICATION_CHANNELS,
-                    since=since_time)
+    notifier.notify(
+        test_analyzed_series={"test": analyzed_series},
+        selector=data_selector,
+        channels=NOTIFICATION_CHANNELS,
+        since=since_time,
+    )
     dispatches = mock_client.dispatches
     assert list(dispatches.keys()) == NOTIFICATION_CHANNELS, "Wrong channels were notified"
     for channel in NOTIFICATION_CHANNELS:
diff --git a/tests/util_test.py b/tests/util_test.py
index 2e529537..63586bad 100644
--- a/tests/util_test.py
+++ b/tests/util_test.py
@@ -1,4 +1,12 @@
-from hunter.util import *
+from hunter.util import (
+    merge_sorted,
+    remove_common_prefix,
+    insert_multiple,
+    sliding_window,
+    merge_dicts,
+    merge_dict_list,
+    interpolate,
+)
 
 
 def test_merge_sorted():