Rethink how metricator will work, golangci-lint and gitlab ci configs.

internal/httpserver/httpserver.go

@@ -40,6 +40,8 @@ func (h *HTTPServer) getRequestContext(_ net.Listener) context.Context {
 // Initializes handler and HTTP server structure.
 func (h *HTTPServer) initialize() {
 	h.handler = &handler{}
+	// We do not need to specify all possible parameters for HTTP server, so:
+	// nolint:exaustivestruct
 	h.server = &http.Server{
 		// ToDo: make it all configurable.
 		Addr:           ":34421",