fix linter errors

roles/prometheus/molecule/default/prometheus/prometheus.yml

@@ -1,6 +1,6 @@
 ---
 global:
-  scrape_interval:     15s
+  scrape_interval: 15s
   evaluation_interval: 15s
 
 rule_files:
@@ -11,4 +11,4 @@ rule_files:
 scrape_configs:
   - job_name: prometheus
     static_configs:
-      - targets: ['localhost:9090']
+      - targets: ['localhost:9090']

roles/prometheus/molecule/default/prometheus/rules/alertrules.yml

@@ -1,13 +1,13 @@
 groups:
-- name: example
-  labels:
-    team: myteam
-  rules:
-  - alert: HighRequestLatency
-    expr: job:request_latency_seconds:mean5m{job="myjob"} > 0.5
-    for: 10m
-    keep_firing_for: 5m
+  - name: example
     labels:
-      severity: page
-    annotations:
-      summary: High request latency
+      team: myteam
+    rules:
+      - alert: HighRequestLatency
+        expr: job:request_latency_seconds:mean5m{job="myjob"} > 0.5
+        for: 10m
+        keep_firing_for: 5m
+        labels:
+          severity: page
+        annotations:
+          summary: High request latency