diff --git a/src/Seq.Api/Model/Diagnostics/ServerMetricsEntity.cs b/src/Seq.Api/Model/Diagnostics/ServerMetricsEntity.cs
index bca4e1c..6bb1079 100644
--- a/src/Seq.Api/Model/Diagnostics/ServerMetricsEntity.cs
+++ b/src/Seq.Api/Model/Diagnostics/ServerMetricsEntity.cs
@@ -28,6 +28,16 @@ public class ServerMetricsEntity : Entity
         public ServerMetricsEntity()
         {
         }
+                
+        /// <summary>
+        /// The start time in UTC of the events in the memory cache.
+        /// </summary>
+        public DateTime? EventStoreCacheStart { get; set; }
+        
+        /// <summary>
+        /// The end time in UTC of the events in the memory cache.
+        /// </summary>
+        public DateTime? EventStoreCacheEnd { get; set; }
 
         /// <summary>
         /// The number of days of events able to fit in the memory cache.
diff --git a/src/Seq.Api/Model/Diagnostics/Storage/ColumnDescriptionPart.cs b/src/Seq.Api/Model/Diagnostics/Storage/ColumnDescriptionPart.cs
new file mode 100644
index 0000000..9393642
--- /dev/null
+++ b/src/Seq.Api/Model/Diagnostics/Storage/ColumnDescriptionPart.cs
@@ -0,0 +1,33 @@
+using System;
+
+namespace Seq.Api.Model.Diagnostics.Storage
+{
+    /// <summary>
+    /// A description of a column in a rowset.
+    /// </summary>
+    public readonly struct ColumnDescriptionPart
+    {
+        /// <summary>
+        /// A label for the column.
+        /// </summary>
+        public string Label { get; }
+        
+        /// <summary>
+        /// Additional metadata describing the role of the column; this is separate from,
+        /// but related to, the runtime type of the column values.
+        /// </summary>
+        public ColumnType Type { get; }
+
+        /// <summary>
+        /// Construct a <see cref="ColumnDescriptionPart"/>.
+        /// </summary>
+        /// <param name="label">A label for the column.</param>
+        /// <param name="type">Additional metadata describing the role of the column; this is separate from,
+        /// but related to, the runtime type of the column values.</param>
+        public ColumnDescriptionPart(string label, ColumnType type)
+        {
+            Label = label ?? throw new ArgumentNullException(nameof(label));
+            Type = type;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Seq.Api/Model/Diagnostics/Storage/ColumnType.cs b/src/Seq.Api/Model/Diagnostics/Storage/ColumnType.cs
new file mode 100644
index 0000000..7de3e51
--- /dev/null
+++ b/src/Seq.Api/Model/Diagnostics/Storage/ColumnType.cs
@@ -0,0 +1,19 @@
+namespace Seq.Api.Model.Diagnostics.Storage
+{
+    /// <summary>
+    /// Additional metadata describing the role of a column; this is separate from,
+    /// but related to, the runtime type of the column values.
+    /// </summary>
+    public enum ColumnType
+    {
+        /// <summary>
+        /// The column contains general data.
+        /// </summary>
+        General,
+        
+        /// <summary>
+        /// The column contains timestamps that may be used to create a timeseries.
+        /// </summary>
+        Timestamp,
+    }
+}
\ No newline at end of file
diff --git a/src/Seq.Api/Model/Diagnostics/Storage/RowsetPart.cs b/src/Seq.Api/Model/Diagnostics/Storage/RowsetPart.cs
new file mode 100644
index 0000000..7632648
--- /dev/null
+++ b/src/Seq.Api/Model/Diagnostics/Storage/RowsetPart.cs
@@ -0,0 +1,19 @@
+namespace Seq.Api.Model.Diagnostics.Storage
+{
+    /// <summary>
+    /// Values in rows and columns.
+    /// </summary>
+    public class RowsetPart
+    {
+        /// <summary>
+        /// The columns of the rowset.
+        /// </summary>
+        public ColumnDescriptionPart[] Columns { get; set; }
+        
+        /// <summary>
+        /// An array of rows, where each row is an array of values
+        /// corresponding to the columns of the rowset.
+        /// </summary>
+        public object[][] Rows { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/src/Seq.Api/Model/Diagnostics/Storage/StorageConsumptionPart.cs b/src/Seq.Api/Model/Diagnostics/Storage/StorageConsumptionPart.cs
new file mode 100644
index 0000000..4cbed6b
--- /dev/null
+++ b/src/Seq.Api/Model/Diagnostics/Storage/StorageConsumptionPart.cs
@@ -0,0 +1,41 @@
+// Copyright © Datalust and contributors. 
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using Seq.Api.Model.Shared;
+
+namespace Seq.Api.Model.Diagnostics.Storage
+{
+    /// <summary>
+    /// Describes storage space consumed by the event store, for a range
+    /// of event timestamps.
+    /// </summary>
+    public class StorageConsumptionPart
+    {
+        /// <summary>
+        /// The range of timestamps covered by the result.
+        /// </summary>
+        public DateTimeRange Range { get; set; }
+
+        /// <summary>
+        /// The duration of the timestamp interval covered by each result.
+        /// </summary>
+        public uint IntervalMinutes { get; set; }
+        
+        /// <summary>
+        /// A potentially-sparse rowset describing the storage space consumed
+        /// for a range of timestamp intervals.
+        /// </summary>
+        public RowsetPart Results { get; set; }
+    }
+}
diff --git a/src/Seq.Api/Model/License/LicenseEntity.cs b/src/Seq.Api/Model/License/LicenseEntity.cs
index ea7aa61..0bdb65e 100644
--- a/src/Seq.Api/Model/License/LicenseEntity.cs
+++ b/src/Seq.Api/Model/License/LicenseEntity.cs
@@ -36,6 +36,11 @@ public class LicenseEntity : Entity
         /// </summary>
         public bool IsSingleUser { get; set; }
 
+        /// <summary>
+        /// If the license is a subscription, the subscription id.
+        /// </summary>
+        public string SubscriptionId { get; set; }
+
         /// <summary>
         /// Information about the status of the license.
         /// </summary>
@@ -56,5 +61,11 @@ public class LicenseEntity : Entity
         /// the license has no user limit.
         /// </summary>
         public int? LicensedUsers { get; set; }
+        
+        /// <summary>
+        /// If the license is for a subscription, automatically check datalust.co and
+        /// update the license when the subscription is renewed or tier changed.
+        /// </summary>
+        public bool AutomaticallyRefresh { get; set; }
     }
 }
diff --git a/src/Seq.Api/Model/Shared/DateTimeRange.cs b/src/Seq.Api/Model/Shared/DateTimeRange.cs
new file mode 100644
index 0000000..8790bdc
--- /dev/null
+++ b/src/Seq.Api/Model/Shared/DateTimeRange.cs
@@ -0,0 +1,31 @@
+using System;
+
+namespace Seq.Api.Model.Shared
+{
+    /// <summary>
+    /// A range represented by a start and end <see cref="DateTime"/>.
+    /// </summary>
+    public readonly struct DateTimeRange
+    {
+        /// <summary>
+        /// The (inclusive) start of the range.
+        /// </summary>
+        public DateTime Start { get; }
+        
+        /// <summary>
+        /// The (exclusive) end of the range.
+        /// </summary>
+        public DateTime End { get; }
+
+        /// <summary>
+        /// Construct a <see cref="DateTimeRange"/>.
+        /// </summary>
+        /// <param name="start">The (inclusive) start of the range.</param>
+        /// <param name="end">The (exclusive) end of the range.</param>
+        public DateTimeRange(DateTime start, DateTime end)
+        {
+            Start = start;
+            End = end;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Seq.Api/ResourceGroups/DiagnosticsResourceGroup.cs b/src/Seq.Api/ResourceGroups/DiagnosticsResourceGroup.cs
index a386bc0..644242c 100644
--- a/src/Seq.Api/ResourceGroups/DiagnosticsResourceGroup.cs
+++ b/src/Seq.Api/ResourceGroups/DiagnosticsResourceGroup.cs
@@ -12,12 +12,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
 using Seq.Api.Model.Diagnostics;
+using Seq.Api.Model.Diagnostics.Storage;
 using Seq.Api.Model.Inputs;
 
+// ReSharper disable UnusedMember.Global
+
 namespace Seq.Api.ResourceGroups
 {
     /// <summary>
@@ -65,11 +69,38 @@ public async Task<string> GetIngestionLogAsync(CancellationToken cancellationTok
         /// </summary>
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> allowing the operation to be canceled.</param>
         /// <param name="measurement">The measurement to get.</param>
-        /// <returns></returns>
+        /// <returns>A timeseries showing the measurement over time.</returns>
         public async Task<MeasurementTimeseriesPart> GetMeasurementTimeseriesAsync(string measurement, CancellationToken cancellationToken = default)
         {
             var parameters = new Dictionary<string, object>{ ["measurement"] = measurement };
             return await GroupGetAsync<MeasurementTimeseriesPart>("Metric", parameters, cancellationToken);
         }
+
+        /// <summary>
+        /// Report on storage space consumed by the event store across a range of timestamps. The returned range may be
+        /// extended to account for the resolution of the underlying data.
+        /// </summary>
+        /// <param name="rangeStart">The (inclusive) start of the range to report on. If omitted, the results will report from the
+        /// earliest stored data. The range start must land on a five-minute boundary.</param>
+        /// <param name="rangeEnd">The (exclusive) end of the range to report on. If omitted, the results will report from the
+        /// earliest stored data. The range must be a multiple of the interval size, or a whole number of days if
+        /// no interval is specified.</param>
+        /// <param name="intervalMinutes">The bucket size to use. Must be a multiple of 5 minutes. Defaults to 1440 (one day).</param>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> allowing the operation to be canceled.</param>
+        /// <returns>Storage consumption information.</returns>
+        public async Task<StorageConsumptionPart> GetStorageConsumptionAsync(
+            DateTime? rangeStart,
+            DateTime? rangeEnd,
+            int? intervalMinutes,
+            CancellationToken cancellationToken = default)
+        {
+            var parameters = new Dictionary<string, object>
+            {
+                ["rangeStart"] = rangeStart,
+                ["rangeEnd"] = rangeEnd,
+                ["intervalMinutes"] = intervalMinutes
+            };
+            return await GroupGetAsync<StorageConsumptionPart>("Storage", parameters, cancellationToken);
+        }
     }
 }
diff --git a/src/Seq.Api/Seq.Api.csproj b/src/Seq.Api/Seq.Api.csproj
index 0de28ea..b20e2a9 100644
--- a/src/Seq.Api/Seq.Api.csproj
+++ b/src/Seq.Api/Seq.Api.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <Description>Client library for the Seq HTTP API.</Description>
-    <VersionPrefix>2020.1.1</VersionPrefix>
+    <VersionPrefix>2020.4.0</VersionPrefix>
     <Authors>Datalust;Contributors</Authors>
     <TargetFramework>netstandard2.0</TargetFramework>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
@@ -14,7 +14,7 @@
     <LangVersion>8</LangVersion>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.2" />
+    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     <PackageReference Include="Tavis.UriTemplates" Version="1.1.1" />
     <None Include="seq-api-icon.png" Pack="true" PackagePath="\"/>
   </ItemGroup>