Switching metrics from port to listen

Dockerfile

@@ -202,15 +202,15 @@ ENV           DNS_PORT=53
 # ENV           DNS_OVER_GRPC_PORT=553
 ENV           DNS_STUFF_MDNS=false
 
-ENV           METRICS_PORT=9253
+ENV           METRICS_LISTEN=:9253
 
 # NOTE: this will not be updated at runtime and will always EXPOSE default values
 # Either way, EXPOSE does not do anything, except function as a documentation helper
 EXPOSE        $DNS_PORT/udp
 EXPOSE        $DNS_OVER_TLS_PORT/tcp
 EXPOSE        $DNS_OVER_TLS_LEGO_PORT/tcp
 #EXPOSE        $DNS_OVER_GRPC_PORT/tcp
-EXPOSE        $METRICS_PORT/tcp
+EXPOSE        $METRICS_LISTEN/tcp
 
 # Lego just needs /certs to work
 VOLUME        /certs

README.md

@@ -175,7 +175,7 @@ You can also tweak the following:
  * DNS_OVER_GRPC_PORT (default to 553)
 -->
  * DNS_STUFF_MDNS: convenient little trick to respond for certain mDNS queries over traditional DNS
- * METRICS_PORT for Prometheuse (default to 9253)
+ * METRICS_LISTEN for Prometheus (default to :9253)
 
 Of course using any privileged port for these requires CAP_NET_BIND_SERVICE.
 

context/runtime/boot/entrypoint.sh

@@ -30,7 +30,7 @@ DNS_PORT="${DNS_PORT:-}"
 DNS_STUFF_MDNS="${DNS_STUFF_MDNS:-}"
 
 # Metrics settings
-METRICS_PORT="${METRICS_PORT:-}"
+METRICS_LISTEN="${METRICS_LISTEN:-}"
 
 certs::renew(){
   local domain="$1"

context/runtime/config/snips/monitor.conf

@@ -3,7 +3,7 @@ health localhost:8091
 # https://coredns.io/plugins/pprof/
 pprof localhost:6053
 # https://coredns.io/plugins/metrics/
-prometheus :{$METRICS_PORT}
+prometheus {$METRICS_LISTEN}
 # https://coredns.io/plugins/log/
 log
 # {combined}