Changed some images and small improvements

monitoring/docker-compose.yaml

@@ -2,7 +2,7 @@ version: "3.3"
 services:
 
   grafana:
-    image: grafana/grafana
+    image: grafana/grafana:7.4.3
     restart: unless-stopped
     expose:
       - "3000"
@@ -54,7 +54,8 @@ services:
 
   # influxdb to store time based data. Adress is drax.fzirker.lan:8086
   influxdb:
-    image: arm32v7/influxdb
+#    image: arm32v7/influxdb
+    image: influxdb:1.8
     restart: unless-stopped
     ports:
       - 8086:8086
@@ -74,7 +75,7 @@ services:
   # here starts data collection
 
   telegraf:
-    image: telegraf
+    image: telegraf:1.18
     restart: unless-stopped
     environment:
       - HOST_MOUNT_PREFIX=/hostfs