Fix missing prom query proxy route (#1298)

Author: jotak

pkg/handler/promproxy.go

@@ -15,6 +15,12 @@ func (h *Handlers) PromProxyRules() func(w http.ResponseWriter, r *http.Request)
 	return simpleProxy(u, cfg.Timeout.Duration, cfg.SkipTLS, cfg.CAPath, cfg.ForwardUserToken, cfg.TokenPath)
 }
 
+func (h *Handlers) PromProxyQuery() func(w http.ResponseWriter, r *http.Request) {
+	u, _ := url.JoinPath(h.Cfg.Prometheus.URL, "/api/v1/query")
+	cfg := &h.Cfg.Prometheus
+	return simpleProxy(u, cfg.Timeout.Duration, cfg.SkipTLS, cfg.CAPath, cfg.ForwardUserToken, cfg.TokenPath)
+}
+
 func (h *Handlers) PromProxySilences() func(w http.ResponseWriter, r *http.Request) {
 	u, _ := url.JoinPath(h.Cfg.Prometheus.AlertManager.URL, "/api/v2/silences")
 	cfg := &h.Cfg.Prometheus

pkg/server/routes.go

@@ -81,6 +81,7 @@ func setupRoutes(ctx context.Context, cfg *config.Config, authChecker auth.Check
 	if cfg.Prometheus.AlertManager.URL != "" {
 		// When AlertManager URL is configured, we don't use the Console proxy; doing our own proxy instead (likely, we're in standalone mode)
 		api.HandleFunc("/prometheus/api/v1/rules", h.PromProxyRules())
+		api.HandleFunc("/prometheus/api/v1/query", h.PromProxyQuery())
 		api.HandleFunc("/alertmanager/api/v2/silences", h.PromProxySilences())
 	} else if cfg.Loki.UseMocks {
 		// Add route for alerts (otherwise, the route is provided by the Console itself)