PMM-2298 Add glob for AlertManager rules.

.codecov.yml

@@ -1,2 +1,6 @@
 coverage:
   range: "60...80"
+  status:
+    patch:
+      default:
+        threshold: 1

.travis.yml

@@ -87,7 +87,6 @@ after_success:
   - bash <(curl -s https://codecov.io/bash) -X fix
 
 notifications:
-  email: false
   slack:
     on_success: change
     on_failure: always

services/prometheus/prometheus.go

@@ -104,6 +104,9 @@ func (svc *Service) marshalConfig(ctx context.Context) ([]byte, error) {
 			ScrapeTimeout:      model.Duration(10 * time.Second),
 			EvaluationInterval: model.Duration(time.Minute),
 		},
+		RuleFiles: []string{
+			"/etc/prometheus.d/*.rules.yml",
+		},
 		ScrapeConfigs: []*config.ScrapeConfig{
 			scrapeConfigForPrometheus(),
 			scrapeConfigForGrafana(),

testdata/prometheus/prometheus.yml

@@ -4,6 +4,8 @@ global:
   scrape_interval: 1m
   scrape_timeout: 10s
   evaluation_interval: 1m
+rule_files:
+- /etc/prometheus.d/*.rules.yml
 scrape_configs:
 - job_name: prometheus
   scrape_interval: 1s