helm: add updateStategy for canary pods (#9760)

**What this PR does / why we need it**:
Allows configuring Canary DaemonSet rollout.

**Which issue(s) this PR fixes**:
N/A

**Special notes for your reviewer**:

**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [x] Documentation added
- [x] Tests updated
- [x] `CHANGELOG.md` updated
- [ ] If the change is worth mentioning in the release notes, add
`add-to-release-notes` label
- [x] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/upgrading/_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](d10549e3ec)

docs/sources/installation/helm/reference.md

@@ -2455,6 +2455,20 @@ null
 			<td><pre lang="json">
 []
 </pre>
+</td>
+		</tr>
+		<tr>
+			<td>monitoring.lokiCanary.updateStrategy</td>
+			<td>object</td>
+			<td>Update strategy for the `loki-canary` Daemonset pods</td>
+			<td><pre lang="json">
+{
+  "rollingUpdate": {
+    "maxUnavailable": 1
+  },
+  "type": "RollingUpdate"
+}
+</pre>
 </td>
 		</tr>
 		<tr>

production/helm/loki/CHANGELOG.md

@@ -12,6 +12,9 @@ Entries should be ordered as follows:
 Entries should include a reference to the pull request that introduced the change.
 
 [//]: # (<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.)
+## 5.8.4
+
+- [ENHANCEMENT] Add loki.lokiCanary.updateStrategy configuration
 
 ## 5.8.3
 

production/helm/loki/Chart.yaml

@@ -3,7 +3,7 @@ name: loki
 description: Helm chart for Grafana Loki in simple, scalable mode
 type: application
 appVersion: 2.8.2
-version: 5.8.3
+version: 5.8.4
 home: https://grafana.github.io/helm-charts
 sources:
   - https://github.com/grafana/loki

production/helm/loki/README.md

@@ -1,6 +1,6 @@
 # loki
 
-![Version: 5.8.3](https://img.shields.io/badge/Version-5.8.3-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.8.2](https://img.shields.io/badge/AppVersion-2.8.2-informational?style=flat-square)
+![Version: 5.8.4](https://img.shields.io/badge/Version-5.8.4-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.8.2](https://img.shields.io/badge/AppVersion-2.8.2-informational?style=flat-square)
 
 Helm chart for Grafana Loki in simple, scalable mode
 

production/helm/loki/templates/loki-canary/daemonset.yaml

@@ -12,6 +12,10 @@ spec:
   selector:
     matchLabels:
       {{- include "loki-canary.selectorLabels" $ | nindent 6 }}
+  {{- with .updateStrategy }}
+  updateStrategy:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
   template:
     metadata:
       annotations:

production/helm/loki/values.yaml

@@ -661,6 +661,12 @@ monitoring:
       digest: null
       # -- Docker image pull policy
       pullPolicy: IfNotPresent
+    # -- Update strategy for the `loki-canary` Daemonset pods
+    updateStrategy:
+      type: RollingUpdate
+      rollingUpdate:
+        maxUnavailable: 1
+
 # Configuration for the write pod(s)
 write:
   # -- Number of replicas for the write