Helm: remove ruler.enabled condition in networkpolicies which lead to…

… linting errors (#11305)

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

This PR removes the `if .Values.ruler.enabled` condition from the
`loki-egress-alertmanager` networkpolicy as this was causing linting
issues (i.e nil pointer) whenever enabling the networkpolicies since the
`ruler` field is not present in the values.

From what I know, the ruler is now part of the backend, thus I also
replaced the `rulerSelectorLabels` by the `backendSelectorLabels`.

**Special notes for your reviewer**:

**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [ ] Documentation added
- [ ] Tests updated
- [x] `CHANGELOG.md` updated
- [ ] 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)
- [ ] If the change is deprecating or removing a configuration option,
update the `deprecated-config.yaml` and `deleted-config.yaml` files
respectively in the `tools/deprecated-config-checker` directory.
[Example
PR](0d4416a)

---------

Signed-off-by: QuantumEnigmaa <thibaud@giantswarm.io>
Co-authored-by: Michel Hollands <42814411+MichelHollands@users.noreply.github.com>

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.)
 
+## 5.40.1
+
+- [BUGFIX] Remove ruler enabled condition in networkpolicies.
+
 ## 5.40.0
 
 - [CHANGE] Add extraContainers parameter for the write pod

production/helm/loki/Chart.yaml

@@ -3,7 +3,7 @@ name: loki
 description: Helm chart for Grafana Loki in simple, scalable mode
 type: application
 appVersion: 2.9.2
-version: 5.40.0
+version: 5.40.1
 home: https://grafana.github.io/helm-charts
 sources:
  - https://github.com/grafana/loki

production/helm/loki/README.md

@@ -1,6 +1,6 @@
 # loki
 
-![Version: 5.40.0](https://img.shields.io/badge/Version-5.40.0-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.9.2](https://img.shields.io/badge/AppVersion-2.9.2-informational?style=flat-square)
+![Version: 5.40.1](https://img.shields.io/badge/Version-5.40.1-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.9.2](https://img.shields.io/badge/AppVersion-2.9.2-informational?style=flat-square)
 
 Helm chart for Grafana Loki in simple, scalable mode
 

production/helm/loki/templates/networkpolicy.yaml

@@ -112,7 +112,6 @@ spec:
  {{- end }}
  {{- end }}
 
-{{- if .Values.ruler.enabled }}
 ---
 apiVersion: networking.k8s.io/v1
 kind: NetworkPolicy
@@ -126,7 +125,7 @@ spec:
  - Egress
  podSelector:
  matchLabels:
- {{- include "loki.rulerSelectorLabels" . | nindent 6 }}
+ {{- include "loki.backendSelectorLabels" . | nindent 6 }}
  egress:
  - ports:
  - port: {{ .Values.networkPolicy.alertmanager.port }}
@@ -140,7 +139,6 @@ spec:
  {{- toYaml .Values.networkPolicy.alertmanager.podSelector | nindent 12 }}
  {{- end }}
  {{- end }}
-{{- end }}
 
 {{- if .Values.networkPolicy.externalStorage.ports }}
 ---