Create metric for long javascript tasks
This is a revert and fix on
https://gerrit-review.googlesource.com/c/gerrit/+/244773
Change-Id: I16a5c303ec8f1b0310a5a86391a8ae90760ef750
diff --git a/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js b/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js
index c62daf9..d169728 100644
--- a/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js
+++ b/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js
@@ -142,6 +142,25 @@
};
catchErrors();
+ // PerformanceObserver interface is a browser API.
+ if (window.PerformanceObserver) {
+ const supportedEntryTypes = PerformanceObserver.supportedEntryTypes || [];
+ // Safari doesn't support longtask yet
+ if (supportedEntryTypes.includes('longtask')) {
+ const catchLongJsTasks = new PerformanceObserver(list => {
+ for (const task of list.getEntries()) {
+ // We are interested in longtask longer than 200 ms (default is 50 ms)
+ if (task.duration > 200) {
+ GrReporting.prototype.reporter(TIMING.TYPE,
+ TIMING.CATEGORY_UI_LATENCY, `Task ${task.name}`,
+ Math.round(task.duration), false);
+ }
+ }
+ });
+ catchLongJsTasks.observe({entryTypes: ['longtask']});
+ }
+ }
+
// The Polymer pass of JSCompiler requires this to be reassignable
// eslint-disable-next-line prefer-const
let GrReporting = Polymer({
