feat: add comment

.env

@@ -129,7 +129,7 @@ METRIC_PRUNING_MAX_REQUEST_METRICS_HISTORY_DAYS=45
 # If we use metric database. If set to false,
 # all metric collection and connection to the DB would be disabled
 # and the service would run without any metrics.
-METRIC_DATABASE_ENABLED=${METRIC_DATABASE_ENABLED:-true}
+METRIC_DATABASE_ENABLED=${METRIC_DATABASE_ENABLED}
 # CACHE_ENABLED specifies if cache should be enabled. By default cache is disabled.
 CACHE_ENABLED=true
 # REDIS_ENDPOINT_URL is an url of redis

.github/workflows/ci-e2e-no-metrics-tests.yml

@@ -17,7 +17,9 @@ jobs:
       - name: pull pre-built images
         run: sudo docker compose -f ci.docker-compose.yml pull
       - name: build and start proxy service and it's dependencies
-        run: METRIC_DATABASE_ENABLED=false sudo docker compose -f ci.docker-compose.yml up -d --build proxy redis
+        # We need to provide additional env file to override the METRIC_DATABASE_ENABLED variable, not via env variable.
+        # Mentioned here: https://github.com/docker/compose/issues/9737
+        run: sudo docker compose -f ci.docker-compose.yml up -d --build proxy redis
         env:
             METRIC_DATABASE_ENABLED: "false"
       - name: wait for proxy service to be running