Add metrics endpoint with http metrics using Prometheus client lib

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        go: [1.15, 1.16]
+        go: [1.16, 1.17, 1.18]
         run_long_tests: [no]
         allow_failure: [false]
         include:
@@ -55,6 +55,11 @@ jobs:
         with:
           go-version: ${{ matrix.go }}
 
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.45.0
+
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
@@ -75,10 +80,6 @@ jobs:
         run: |
            make version
 
-      - name: Make prepare
-        run: |
-          make prepare
-
       - name: Make
         env:
           RUN_LONG_TESTS: ${{ matrix.run_long_tests }}