feat(helm): Add health probes to loki-canary

This change makes it possible to configure `livenessProbe` and
`startupProbe` for the loki-canary container in the loki-canary pods.

reference.md was updated via the following command:

```shell
docker run -it --rm -v "$(pwd):/go" --entrypoint bash -e BUILD_IN_CONTAINER=false grafana/loki-build-image:0.34.7.1 -c 'git config --global --add safe.directory /go; make -BC docs sources/setup/install/helm/reference.md'
```

Signed-off-by: Andreas Lindhé <[email protected]>

Author: lindhe

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

@@ -7665,6 +7665,15 @@ null
 			<td><pre lang="json">
 "pod"
 </pre>
+</td>
+		</tr>
+		<tr>
+			<td>lokiCanary.livenessProbe</td>
+			<td>string</td>
+			<td>Liveness probe</td>
+			<td><pre lang="json">
+null
+</pre>
 </td>
 		</tr>
 		<tr>
@@ -7762,6 +7771,15 @@ true
 			<td><pre lang="json">
 {}
 </pre>
+</td>
+		</tr>
+		<tr>
+			<td>lokiCanary.startupProbe</td>
+			<td>string</td>
+			<td>Startup probe</td>
+			<td><pre lang="json">
+null
+</pre>
 </td>
 		</tr>
 		<tr>

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

@@ -105,10 +105,18 @@ spec:
           envFrom:
             {{- toYaml . | nindent 12 }}
           {{- end }}
+          {{- with .livenessProbe }}
+          livenessProbe:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
           {{- with .readinessProbe }}
           readinessProbe:
             {{- toYaml . | nindent 12 }}
           {{- end }}
+          {{- with .startupProbe }}
+          startupProbe:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
           {{- with .resources}}
           resources:
             {{- toYaml . | nindent 12 }}

production/helm/loki/values.yaml

@@ -833,13 +833,17 @@ lokiCanary:
     digest: null
     # -- Docker image pull policy
     pullPolicy: IfNotPresent
+  # -- Liveness probe
+  livenessProbe:
   # -- Readiness probe
   readinessProbe:
     httpGet:
       path: /metrics
       port: http-metrics
     initialDelaySeconds: 15
     timeoutSeconds: 1
+  # -- Startup probe
+  startupProbe:
   # -- Update strategy for the `loki-canary` Daemonset pods
   updateStrategy:
     type: RollingUpdate