helm: Allow altering the canary label name (#9945)

**What this PR does / why we need it**:

Allows changing the label name at the canary in the helm chart.

**Which issue(s) this PR fixes**:
Idk, none?

**Special notes for your reviewer**:

This is a very trivial change.

**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
- [x] 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](d10549e)

---------

Co-authored-by: Michel Hollands <42814411+MichelHollands@users.noreply.github.com>
Co-authored-by: Travis Patterson <travis.patterson@grafana.com>

docs/sources/installation/helm/reference.md

@@ -2411,6 +2411,15 @@ null
 			<td><pre lang="json">
 null
 </pre>
+</td>
+		</tr>
+		<tr>
+			<td>monitoring.lokiCanary.labelname</td>
+			<td>string</td>
+			<td>The name of the label to look for at loki when doing the checks.</td>
+			<td><pre lang="json">
+"pod"
+</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.)
 
+## 5.8.10
+
+- [ENHANCEMENT] Canary labelname can now be configured via monitoring.lokiCanary.labelname
+
 ## 5.8.9
 
 - [BUGFIX] Fix loki/logs dashboard: allow querying multiple log level at once

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: 5.8.9
+version: 5.8.10
 home: https://grafana.github.io/helm-charts
 sources:
   - https://github.com/grafana/loki

production/helm/loki/README.md

@@ -1,6 +1,6 @@
 # loki
 
-![Version: 5.8.9](https://img.shields.io/badge/Version-5.8.9-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: 5.8.10](https://img.shields.io/badge/Version-5.8.10-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

@@ -42,7 +42,7 @@ spec:
           imagePullPolicy: {{ $.Values.loki.image.pullPolicy }}
           args:
             - -addr={{- include "loki.host" $ }}
-            - -labelname=pod
+            - -labelname={{ .labelname }}
             - -labelvalue=$(POD_NAME)
             {{- if $.Values.enterprise.enabled }}
             - -user=$(USER)

production/helm/loki/values.yaml

@@ -637,6 +637,8 @@ monitoring:
   # that it's working correctly
   lokiCanary:
     enabled: true
+    # -- The name of the label to look for at loki when doing the checks.
+    labelname: pod
     # -- Additional annotations for the `loki-canary` Daemonset
     annotations: {}
     # -- Additional labels for each `loki-canary` pod