Add yaml linting step to helm ci (grafana#8822)

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

Adds a yaml linting step for the included rules in the loki helm chart.
Only way I could think to enforce the comma line ending was to require
qutoes around string, otherwise the linter cannot tell if the comma is
just part of the string.

.github/workflows/helm-ci.yml

@@ -24,6 +24,9 @@ jobs:
               exit 1
           fi
 
+      - name: Lint Yaml
+        run: make helm-lint
+
       - name: Lint Code Base
         uses: docker://github/super-linter:v3.12.0
         env:

Makefile

@@ -11,6 +11,7 @@
 .PHONY: validate-example-configs generate-example-config-doc check-example-config-doc
 .PHONY: clean clean-protos
 .PHONY: k3d-loki k3d-enterprise-logs k3d-down
+.PHONY: helm-test helm-lint
 
 SHELL = /usr/bin/env bash -o pipefail
 
@@ -160,7 +161,7 @@ cmd/loki-canary/loki-canary:
 	CGO_ENABLED=0 go build $(GO_FLAGS) -o $@ ./$(@D)
 
 ###############
-# Helm-Test #
+# Helm #
 ###############
 .PHONY: production/helm/loki/src/helm-test/helm-test
 helm-test: production/helm/loki/src/helm-test/helm-test
@@ -169,6 +170,9 @@ helm-test: production/helm/loki/src/helm-test/helm-test
 production/helm/loki/src/helm-test/helm-test:
 	CGO_ENABLED=0 go test $(GO_FLAGS) --tags=helm_test -c -o $@ ./$(@D)
 
+helm-lint:
+	$(MAKE) -BC production/helm/loki lint
+
 #################
 # Loki-QueryTee #
 #################

production/helm/loki/Makefile

@@ -0,0 +1,7 @@
+.DEFAULT_GOAL := all
+.PHONY: lint lint-yaml
+
+lint: lint-yaml
+
+lint-yaml:
+	yamllint -c $(CURDIR)/src/.yamllint.yaml $(CURDIR)/src

production/helm/loki/src/.yamllint.yaml

@@ -0,0 +1,4 @@
+---
+rules:
+  quoted-strings:
+    required: true

production/helm/loki/src/alerts.yaml

@@ -1,52 +1,53 @@
+---
 groups:
-- name: loki_alerts
-  rules:
-  - alert: LokiRequestErrors
-    annotations:
-      message: |
-        {{ $labels.job }} {{ $labels.route }} is experiencing {{ printf "%.2f" $value }}% errors.
-    expr: |
-      100 * sum(rate(loki_request_duration_seconds_count{status_code=~"5.."}[2m])) by (namespace, job, route)
-        /
-      sum(rate(loki_request_duration_seconds_count[2m])) by (namespace, job, route)
-        > 10
-    for: 15m
-    labels:
-      severity: critical
-  - alert: LokiRequestPanics
-    annotations:
-      message: |
-        {{ $labels.job }} is experiencing {{ printf "%.2f" $value }}% increase of panics.
-    expr: |
-      sum(increase(loki_panic_total[10m])) by (namespace, job) > 0
-    labels:
-      severity: critical
-  - alert: LokiRequestLatency
-    annotations:
-      message: |
-        {{ $labels.job }} {{ $labels.route }} is experiencing {{ printf "%.2f" $value }}s 99th percentile latency.
-    expr: |
-      namespace_job_route:loki_request_duration_seconds:99quantile{route!~"(?i).*tail.*"} > 1
-    for: 15m
-    labels:
-      severity: critical
-  - alert: LokiTooManyCompactorsRunning
-    annotations:
-      message: |
-        {{ $labels.cluster }} {{ $labels.namespace }} has had {{ printf "%.0f" $value }} compactors running for more than 5m. Only one compactor should run at a time.
-    expr: |
-      sum(loki_boltdb_shipper_compactor_running) by (namespace, cluster) > 1
-    for: 5m
-    labels:
-      severity: warning
-- name: 'loki_canaries_alerts'
-  rules:
-  - alert: 'LokiCanaryLatency'
-    annotations:
-      message: |
-        {{ $labels.job }} is experiencing {{ printf "%.2f" $value }}s 99th percentile latency.
-    expr: |
-      histogram_quantile(0.99, sum(rate(loki_canary_response_latency_seconds_bucket[5m])) by (le, namespace, job)) > 5
-    for: '15m'
-    labels:
-      severity: 'warning'
+  - name: "loki_alerts"
+    rules:
+      - alert: "LokiRequestErrors"
+        annotations:
+          message: |
+            {{ $labels.job }} {{ $labels.route }} is experiencing {{ printf "%.2f" $value }}% errors.
+        expr: |
+          100 * sum(rate(loki_request_duration_seconds_count{status_code=~"5.."}[2m])) by (namespace, job, route)
+            /
+          sum(rate(loki_request_duration_seconds_count[2m])) by (namespace, job, route)
+            > 10
+        for: "15m"
+        labels:
+          severity: "critical"
+      - alert: "LokiRequestPanics"
+        annotations:
+          message: |
+            {{ $labels.job }} is experiencing {{ printf "%.2f" $value }}% increase of panics.
+        expr: |
+          sum(increase(loki_panic_total[10m])) by (namespace, job) > 0
+        labels:
+          severity: "critical"
+      - alert: "LokiRequestLatency"
+        annotations:
+          message: |
+            {{ $labels.job }} {{ $labels.route }} is experiencing {{ printf "%.2f" $value }}s 99th percentile latency.
+        expr: |
+          namespace_job_route:loki_request_duration_seconds:99quantile{route!~"(?i).*tail.*"} > 1
+        for: "15m"
+        labels:
+          severity: "critical"
+      - alert: "LokiTooManyCompactorsRunning"
+        annotations:
+          message: |
+            {{ $labels.cluster }} {{ $labels.namespace }} has had {{ printf "%.0f" $value }} compactors running for more than 5m. Only one compactor should run at a time.
+        expr: |
+          sum(loki_boltdb_shipper_compactor_running) by (namespace, cluster) > 1
+        for: "5m"
+        labels:
+          severity: "warning"
+  - name: "loki_canaries_alerts"
+    rules:
+      - alert: "LokiCanaryLatency"
+        annotations:
+          message: |
+            {{ $labels.job }} is experiencing {{ printf "%.2f" $value }}s 99th percentile latency.
+        expr: |
+          histogram_quantile(0.99, sum(rate(loki_canary_response_latency_seconds_bucket[5m])) by (le, namespace, job)) > 5
+        for: "15m"
+        labels:
+          severity: "warning"