Helm: allow GrafanaAgent tolerations (#10613)

**What this PR does / why we need it**:
Helm: Allow setting tolerations for GrafanaAgent pods in order to have
them scheduled to tainted nodes as well.

**Which issue(s) this PR fixes**:
Fixes #10575

**Special notes for your reviewer**:
n/a

**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [x] Documentation added
- [ ] Tests updated
- [x] `CHANGELOG.md` updated
- [x] If the change is worth mentioning in the release notes, add
`add-to-release-notes` label
- [ ] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/setup/upgrade/_index.md`
- [x] For Helm chart changes bump the Helm chart version in
`production/helm/loki/Chart.yaml` and update
`production/helm/loki/CHANGELOG.md` and
`production/helm/loki/README.md`. [Example
PR](d10549e)

---------

Co-authored-by: J Stickler <julie.stickler@grafana.com>
Co-authored-by: Michel Hollands <42814411+MichelHollands@users.noreply.github.com>

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 ##### Enhancements
 
+* [10613](https://github.com/grafana/loki/pull/10613) **ngc4579**: Helm: allow GrafanaAgent tolerations
 * [10295](https://github.com/grafana/loki/pull/10295) **changhyuni**: Storage: remove signatureversionv2 from s3.
 * [10140](https://github.com/grafana/loki/pull/10140) **dannykopping**: Dynamic client-side throttling to avoid object storage rate-limits (GCS only)
 * [10302](https://github.com/grafana/loki/pull/10302) **ashwanthgoli**: Removes already deprecated `-querier.engine.timeout` CLI flag and corresponding YAML setting as well as the `querier.query_timeout` YAML setting.

docs/sources/setup/install/helm/reference.md

@@ -2682,6 +2682,15 @@ true
 			<td><pre lang="json">
 null
 </pre>
+</td>
+		</tr>
+		<tr>
+			<td>monitoring.selfMonitoring.grafanaAgent.tolerations</td>
+			<td>list</td>
+			<td>Tolerations for GrafanaAgent pods</td>
+			<td><pre lang="json">
+[]
+</pre>
 </td>
 		</tr>
 		<tr>

production/helm/loki/CHANGELOG.md

@@ -13,6 +13,10 @@ Entries should include a reference to the pull request that introduced the chang
 
 [//]: # (<AUTOMATED_UPDATES_LOCATOR> : do not remove this line. This locator is used by the CI pipeline to automatically create a changelog entry for each new Loki release. Add other chart versions and respective changelog entries bellow this line.)
 
+## 5.24.0
+
+- [ENHANCEMENT] #10613 Allow tolerations for GrafanaAgent pods
+
 ## 5.23.1
 
 - [BUGFIX] Add missing namespaces to some components

production/helm/loki/Chart.yaml

@@ -3,7 +3,7 @@ name: loki
 description: Helm chart for Grafana Loki in simple, scalable mode
 type: application
 appVersion: 2.9.1
-version: 5.23.1
+version: 5.24.0
 home: https://grafana.github.io/helm-charts
 sources:
   - https://github.com/grafana/loki

production/helm/loki/README.md

@@ -1,6 +1,6 @@
 # loki
 
-![Version: 5.23.1](https://img.shields.io/badge/Version-5.23.1-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.9.1](https://img.shields.io/badge/AppVersion-2.9.1-informational?style=flat-square)
+![Version: 5.24.0](https://img.shields.io/badge/Version-5.24.0-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.9.1](https://img.shields.io/badge/AppVersion-2.9.1-informational?style=flat-square)
 
 Helm chart for Grafana Loki in simple, scalable mode
 

production/helm/loki/templates/monitoring/grafana-agent.yaml

@@ -29,6 +29,10 @@ spec:
       matchLabels:
         {{- include "loki.selectorLabels" $ | nindent 8 }}
   {{- end }}
+  {{- with .tolerations }}
+  tolerations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
   {{- end }}
 
 ---

production/helm/loki/values.yaml

@@ -631,6 +631,8 @@ monitoring:
       enableConfigReadAPI: false
       # -- The name of the PriorityClass for GrafanaAgent pods
       priorityClassName: null
+      # -- Tolerations for GrafanaAgent pods
+      tolerations: []
     # PodLogs configuration
     podLogs:
       # -- PodLogs annotations