tests/tiup-cluster: check prometheus monitored components (#1041)

* fix(cluster/spec): missing {alertmanager,grafana}s

* typo(tests/tiup-cluster): wrong use grep expr

* fix(tests/tiup-cluster): tiflash only available if no_tls

pkg/cluster/spec/prometheus.go

@@ -213,14 +213,14 @@ func (i *MonitorInstance) InitConfig(
 			cfig.AddCDC(cdc.Host, uint64(cdc.Port))
 		}
 	}
-	if servers, found := topoHasField("Grafana"); found {
+	if servers, found := topoHasField("Grafanas"); found {
 		for i := 0; i < servers.Len(); i++ {
 			grafana := servers.Index(i).Interface().(GrafanaSpec)
 			uniqueHosts.Insert(grafana.Host)
 			cfig.AddGrafana(grafana.Host, uint64(grafana.Port))
 		}
 	}
-	if servers, found := topoHasField("Alertmanager"); found {
+	if servers, found := topoHasField("Alertmanagers"); found {
 		for i := 0; i < servers.Len(); i++ {
 			alertmanager := servers.Index(i).Interface().(AlertmanagerSpec)
 			uniqueHosts.Insert(alertmanager.Host)

tests/tiup-cluster/script/scale_tools.sh

@@ -25,6 +25,13 @@ function scale_tools() {
     tiup-cluster $client exec $name -N n1 --command "grep magic-string-for-test /home/tidb/deploy/prometheus-9090/conf/tidb.rules.yml"
     tiup-cluster $client exec $name -N n1 --command "grep magic-string-for-test /home/tidb/deploy/grafana-3000/dashboards/tidb.json"
     tiup-cluster $client exec $name -N n1 --command "grep magic-string-for-test /home/tidb/deploy/alertmanager-9093/conf/alertmanager.yml"
+    tiup-cluster $client exec $name -N n1 --command "grep alertmanagers /home/tidb/deploy/prometheus-9090/conf/prometheus.yml"
+    for item in pump drainer tidb tikv pd grafana node_exporter blackbox_exporter; do
+        tiup-cluster $client exec $name -N n1 --command "grep $item /home/tidb/deploy/prometheus-9090/conf/prometheus.yml"
+    done
+    if [ $test_tls = false ]; then
+        tiup-cluster $client exec $name -N n1 --command "grep tiflash /home/tidb/deploy/prometheus-9090/conf/prometheus.yml"
+    fi
 
     tiup-cluster $client list | grep "$name"