chore(deps): update prom/prometheus docker tag to v3.9.1 (#8033)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [prom/prometheus](https://redirect.github.com/prometheus/prometheus) |
minor | `v3.8.1` → `v3.9.1` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>prometheus/prometheus (prom/prometheus)</summary>

###
[`v3.9.1`](https://redirect.github.com/prometheus/prometheus/releases/tag/v3.9.1):
3.9.1 / 2026-01-07

[Compare
Source](https://redirect.github.com/prometheus/prometheus/compare/v3.9.0...v3.9.1)

- \[BUGFIX] Agent: fix crash shortly after startup from invalid type of
object.
[#&#8203;17802](https://redirect.github.com/prometheus/prometheus/issues/17802)
- \[BUGFIX] Scraping: fix relabel keep/drop not working.
[#&#8203;17807](https://redirect.github.com/prometheus/prometheus/issues/17807)

###
[`v3.9.0`](https://redirect.github.com/prometheus/prometheus/releases/tag/v3.9.0):
3.9.0 / 2026-01-06

[Compare
Source](https://redirect.github.com/prometheus/prometheus/compare/v3.8.1...v3.9.0)

##### Note for users of Native Histograms

In version 3.9, Native Histograms is no longer experimental, and the
feature flag `native-histogram` has no effect. You must now turn on
the config setting `scrape_native_histograms` to collect Native
Histogram samples from exporters.

##### Changelog

- \[CHANGE] Native Histograms are no longer experimental! Make the
`native-histogram` feature flag a no-op. Use `scrape_native_histograms`
config option instead.
[#&#8203;17528](https://redirect.github.com/prometheus/prometheus/issues/17528)
- \[CHANGE] API: Add maximum limit of 10,000 sets of statistics to TSDB
status endpoint.
[#&#8203;17647](https://redirect.github.com/prometheus/prometheus/issues/17647)
- \[FEATURE] API: Add /api/v1/features for clients to understand which
features are supported.
[#&#8203;17427](https://redirect.github.com/prometheus/prometheus/issues/17427)
- \[FEATURE] Promtool: Add `start_timestamp` field for unit tests.
[#&#8203;17636](https://redirect.github.com/prometheus/prometheus/issues/17636)
- \[FEATURE] Promtool: Add `--format seriesjson` option to `tsdb dump`
to output just series labels in JSON format.
[#&#8203;13409](https://redirect.github.com/prometheus/prometheus/issues/13409)
- \[FEATURE] Add `--storage.tsdb.delay-compact-file.path` flag for
better interoperability with Thanos.
[#&#8203;17435](https://redirect.github.com/prometheus/prometheus/issues/17435)
- \[FEATURE] UI: Add an option on the query drop-down menu to duplicate
that query panel.
[#&#8203;17714](https://redirect.github.com/prometheus/prometheus/issues/17714)
- \[ENHANCEMENT]: TSDB: add flag `--storage.tsdb.block-reload-interval`
to configure TSDB Block Reload Interval.
[#&#8203;16728](https://redirect.github.com/prometheus/prometheus/issues/16728)
- \[ENHANCEMENT] UI: Add graph option to start the chart's Y axis at
zero.
[#&#8203;17565](https://redirect.github.com/prometheus/prometheus/issues/17565)
- \[ENHANCEMENT] Scraping: Classic protobuf format no longer requires
the unit in the metric name.
[#&#8203;16834](https://redirect.github.com/prometheus/prometheus/issues/16834)
- \[ENHANCEMENT] PromQL, Rules, SD, Scraping: Add native histograms to
complement existing summaries.
[#&#8203;17374](https://redirect.github.com/prometheus/prometheus/issues/17374)
- \[ENHANCEMENT] Notifications: Add a histogram
`prometheus_notifications_latency_histogram_seconds` to complement the
existing summary.
[#&#8203;16637](https://redirect.github.com/prometheus/prometheus/issues/16637)
- \[ENHANCEMENT] Remote-write: Add custom scope support for AzureAD
authentication.
[#&#8203;17483](https://redirect.github.com/prometheus/prometheus/issues/17483)
- \[ENHANCEMENT] SD: add a `config` label with job name for most
`prometheus_sd_refresh` metrics.
[#&#8203;17138](https://redirect.github.com/prometheus/prometheus/issues/17138)
- \[ENHANCEMENT] TSDB: New histogram `prometheus_tsdb_sample_ooo_delta`,
the distribution of out-of-order samples in seconds. Collected for all
samples, accepted or not.
[#&#8203;17477](https://redirect.github.com/prometheus/prometheus/issues/17477)
- \[ENHANCEMENT] Remote-read: Validate histograms received via
remote-read.
[#&#8203;17561](https://redirect.github.com/prometheus/prometheus/issues/17561)
- \[PERF] TSDB: Small optimizations to postings index.
[#&#8203;17439](https://redirect.github.com/prometheus/prometheus/issues/17439)
- \[PERF] Scraping: Speed up relabelling of series.
[#&#8203;17530](https://redirect.github.com/prometheus/prometheus/issues/17530)
- \[PERF] PromQL: Small optimisations in binary operators.
[#&#8203;17524](https://redirect.github.com/prometheus/prometheus/issues/17524),
[#&#8203;17519](https://redirect.github.com/prometheus/prometheus/issues/17519).
- \[BUGFIX] UI: PromQL autocomplete now shows the correct type and HELP
text for OpenMetrics counters whose samples end in `_total`.
[#&#8203;17682](https://redirect.github.com/prometheus/prometheus/issues/17682)
- \[BUGFIX] UI: Fixed codemirror-promql incorrectly showing label
completion suggestions after the closing curly brace of a vector
selector.
[#&#8203;17602](https://redirect.github.com/prometheus/prometheus/issues/17602)
- \[BUGFIX] UI: Query editor no longer suggests a duration unit if one
is already present after a number.
[#&#8203;17605](https://redirect.github.com/prometheus/prometheus/issues/17605)
- \[BUGFIX] PromQL: Fix some "vector cannot contain metrics with the
same labelset" errors when experimental delayed name removal is enabled.
[#&#8203;17678](https://redirect.github.com/prometheus/prometheus/issues/17678)
- \[BUGFIX] PromQL: Fix possible corruption of PromQL text if the query
had an empty `ignoring()` and non-empty grouping.
[#&#8203;17643](https://redirect.github.com/prometheus/prometheus/issues/17643)
- \[BUGFIX] PromQL: Fix resets/changes to return empty results for
anchored selectors when all samples are outside the range.
[#&#8203;17479](https://redirect.github.com/prometheus/prometheus/issues/17479)
- \[BUGFIX] PromQL: Check more consistently for many-to-one matching in
filter binary operators.
[#&#8203;17668](https://redirect.github.com/prometheus/prometheus/issues/17668)
- \[BUGFIX] PromQL: Fix collision in unary negation with non-overlapping
series.
[#&#8203;17708](https://redirect.github.com/prometheus/prometheus/issues/17708)
- \[BUGFIX] PromQL: Fix collision in label\_join and label\_replace with
non-overlapping series.
[#&#8203;17703](https://redirect.github.com/prometheus/prometheus/issues/17703)
- \[BUGFIX] PromQL: Fix bug with inconsistent results for queries with
OR expression when experimental delayed name removal is enabled.
[#&#8203;17161](https://redirect.github.com/prometheus/prometheus/issues/17161)
- \[BUGFIX] PromQL: Ensure that `rate`/`increase`/`delta` of histograms
results in a gauge histogram.
[#&#8203;17608](https://redirect.github.com/prometheus/prometheus/issues/17608)
- \[BUGFIX] PromQL: Do not panic while iterating over invalid
histograms.
[#&#8203;17559](https://redirect.github.com/prometheus/prometheus/issues/17559)
- \[BUGFIX] TSDB: Reject chunk files whose encoded chunk length
overflows int.
[#&#8203;17533](https://redirect.github.com/prometheus/prometheus/issues/17533)
- \[BUGFIX] TSDB: Do not panic during resolution reduction of invalid
histograms.
[#&#8203;17561](https://redirect.github.com/prometheus/prometheus/issues/17561)
- \[BUGFIX] Remote-write Receive: Avoid duplicate labels when
experimental type-and-unit-label feature is enabled.
[#&#8203;17546](https://redirect.github.com/prometheus/prometheus/issues/17546)
- \[BUGFIX] OTLP Receiver: Only write metadata to disk when experimental
metadata-wal-records feature is enabled.
[#&#8203;17472](https://redirect.github.com/prometheus/prometheus/issues/17472)

</details>

---

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docker-compose/monitor/docker-compose-v1.yml

@@ -44,7 +44,7 @@ services:
   prometheus:
     networks:
       - backend
-    image: prom/prometheus:v3.8.1@sha256:2b6f734e372c1b4717008f7d0a0152316aedd4d13ae17ef1e3268dbfaf68041b
+    image: prom/prometheus:v3.9.1@sha256:1f0f50f06acaceb0f5670d2c8a658a599affe7b0d8e78b898c1035653849a702
     volumes:
       - "./prometheus.yml:/etc/prometheus/prometheus.yml"
     ports:

docker-compose/monitor/docker-compose.yml

@@ -31,7 +31,7 @@ services:
   prometheus:
     networks:
       - backend
-    image: prom/prometheus:v3.8.1@sha256:2b6f734e372c1b4717008f7d0a0152316aedd4d13ae17ef1e3268dbfaf68041b
+    image: prom/prometheus:v3.9.1@sha256:1f0f50f06acaceb0f5670d2c8a658a599affe7b0d8e78b898c1035653849a702
     volumes:
       - "./prometheus.yml:/etc/prometheus/prometheus.yml"
     ports: