CBG-4768: add missing silent handler logging level for admin port _expvar (#7646)

Author: gregns1

rest/api_test.go

@@ -3205,4 +3205,9 @@ func TestSilentHandlerLoggingInTrace(t *testing.T) {
 		resp := rt.SendMetricsRequestWithHeaders(http.MethodGet, "/_expvar", "", headers)
 		RequireStatus(t, resp, http.StatusOK)
 	})
+
+	base.AssertLogNotContains(t, "/_expvar", func() {
+		resp := rt.SendAdminRequest(http.MethodGet, "/_expvar", "")
+		RequireStatus(t, resp, http.StatusOK)
+	})
 }

rest/routing.go

@@ -287,7 +287,7 @@ func CreateAdminRouter(sc *ServerContext) *mux.Router {
 		makeHandler(sc, adminPrivs, []Permission{PermStatsExport}, nil, (*handler).handleStats)).Methods("GET")
 	r.Handle(kDebugURLPathPrefix,
 		makeHandlerWithOptions(sc, adminPrivs, []Permission{PermStatsExport}, nil, (*handler).handleExpvar, handlerOptions{
-			httpLogLevel: base.Ptr(base.LevelDebug), // silent handler
+			httpLogLevel: base.Ptr(silentRequestLogLevel), // silent handler
 			sgcollect:    true,
 		})).Methods("GET")
 	r.Handle("/_profile/{profilename}",