20220517 PiHole - master branch - PR 1 of 3

Adds health-check functionality to Grafana and InfluxDB 1.8, as
discussed in SensorsIot#415.

Health-check functionality already added to Mosquitto via SensorsIot#406.

Closes SensorsIot#415

Signed-off-by: Phill Kelley <34226495+Paraphraser@users.noreply.github.com>

.templates/grafana/service.yml

@@ -12,4 +12,10 @@ grafana:
   volumes:
     - ./volumes/grafana/data:/var/lib/grafana
     - ./volumes/grafana/log:/var/log/grafana
+  healthcheck:
+    test: ["CMD", "wget", "-O", "/dev/null", "http://localhost:3000"]
+    interval: 30s
+    timeout: 10s
+    retries: 3
+    start_period: 30s
 

.templates/influxdb/service.yml

@@ -18,4 +18,10 @@ influxdb:
   volumes:
     - ./volumes/influxdb/data:/var/lib/influxdb
     - ./backups/influxdb/db:/var/lib/influxdb/backup
+  healthcheck:
+    test: ["CMD", "curl", "http://localhost:8086"]
+    interval: 30s
+    timeout: 10s
+    retries: 3
+    start_period: 30s