Replace evaluate variables in prometheus.yml

.gitignore

@@ -10,4 +10,5 @@ cluster-lock.json
 .DS_Store
 data/
 .idea
-.charon
+.charon
+prometheus/prometheus.yml

docker-compose.yml

@@ -143,11 +143,9 @@ services:
     user: ":"
     networks: [dvnode]
     volumes:
-      - ./prometheus/prometheus.yml:/etc/prometheus/prometheus.yml
+      - ./prometheus:/etc/prometheus
       - ./data/prometheus:/prometheus
-    command: 
-      - "--enable-feature=expand-external-labels"
-      - "--config.file=/etc/prometheus/prometheus.yml"
+    entrypoint: /etc/prometheus/run.sh
     restart: unless-stopped
 
   grafana:

prometheus/prometheus.yml → prometheus/prometheus.yml.example

@@ -2,12 +2,12 @@ global:
   scrape_interval: 30s # Set the scrape interval to every 30 seconds.
   evaluation_interval: 30s # Evaluate rules every 30 seconds.
   external_labels:
-    service_owner: ${SERVICE_OWNER} # replace this with your Operator name you want to be identified by, it helps us route alerts and metrics to your notification channels easily
+    service_owner: ${SERVICE_OWNER:-charon_user} # replace this with your Operator name you want to be identified by, it helps us route alerts and metrics to your notification channels easily
 
 remote_write:
   - url: https://vm.monitoring.gcp.obol.tech/write
     authorization:
-      credentials: $PROM_REMOTE_WRITE_TOKEN
+      credentials: ${PROM_REMOTE_WRITE_TOKEN}
     write_relabel_configs:
       - source_labels: [job]
         regex: "charon"

prometheus/run.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+if [ -z "$SERVICE_OWNER" ]
+then
+  echo "\$SERVICE_OWNER variable is empty"
+fi
+
+if [ -z "$PROM_REMOTE_WRITE_TOKEN" ]
+then
+  echo "\$PROM_REMOTE_WRITE_TOKEN variable is empty"
+fi
+
+# eval is used instead of envsubst, as prometheus user doesn't have permissions to install envsubst
+eval "echo \"$(cat /etc/prometheus/prometheus.yml.example)\"" > /etc/prometheus/prometheus.yml
+
+/bin/prometheus \
+  --config.file=/etc/prometheus/prometheus.yml