fix: remove invalid variable from ci and fix mapcopy function.

.github/workflows/docker-publish.yml

@@ -1,4 +1,4 @@
-name: Docker
+name: Docker build & push
 
 # This workflow uses actions that are not certified by GitHub.
 # They are provided by a third-party and are governed by
@@ -77,5 +77,5 @@ jobs:
           context: .
           platforms: linux/amd64,linux/arm64
           push: ${{ (github.event_name != 'pull_request' || inputs.force_docker_push == true ) && inputs.dry_run != true }}
-          tags: '${{ steps.meta.outputs.tags || inputs.tags }}${{ matrix.image_suffix }}'
+          tags: '${{ steps.meta.outputs.tags || inputs.tags }}'
           labels: ${{ steps.meta.outputs.labels || inputs.labels }}

main.go

@@ -123,7 +123,7 @@ func (c *dockerHealthCollector) collectMetrics(ch chan<- prometheus.Metric) {
 		}
 		mapcopy := func(src map[string]string) prometheus.Labels {
 			dst := map[string]string{}
-			for k, v := range labels {
+			for k, v := range src {
 				dst[k] = v
 			}
 			return dst