Incomplete timeline information using Tracing domain

Component	Version
Operating system	Ubuntu 18.04
Node.js	8.11.2
Chrome/Chromium/…	68
chrome-remote-interface	0.26

Is Chrome running in a container? NO

Snippet of code to obtain timeline information

rawEvents = []
Tracing.dataCollected(function(data){
                var events = data.value;
                rawEvents = rawEvents.concat(events);
            });
Page.loadEventFired(function(){Tracing.end()});
Tracing.start(); Page.navigate({'url': 'http://github.com'});

When I dump the contents of rawEvents in a file and load inside chrome’s performance tab using the graphical interface, it gives an empty timeline.

[cyrus-and]

I didn’t thoroughly check the output, I just noticed that something has been loaded.

Anyway, if you inspect DevTools during the tracing you can see that it’s using something like this:

{
  "id": 63,
  "method": "Tracing.start",
  "params": {
    "categories": "-*,devtools.timeline,v8.execute,disabled-by-default-devtools.timeline,disabled-by-default-devtools.timeline.frame,toplevel,blink.console,blink.user_timing,latencyInfo,disabled-by-default-devtools.timeline.stack,disabled-by-default-devtools.screenshot",
    "options": "sampling-frequency=10000",
    "bufferUsageReportingInterval": 500,
    "transferMode": "ReportEvents"
  }
}

Maybe you could try playing with the categories param (not sure if it defaults to “everything”). I’m shooting in the dark here…

[goelayu]

Perfect, that seems to work. Thanks a lot!

I don’t know why the dev protocol says the ‘categories’ option is deprecated since not using that doesn’t work with the latest version of Chrome. I would leave it up to you guys if the dev protocol should be updated, or the example provided as a part of this repo.

I’ll be closing this issue.