Optional argsAny arguments provided for the event. Some of the event types have required argument fields, otherwise, you can put any information you wish in here. The arguments are displayed in Trace Viewer when you view an event in the analysis section.
Optional catThe event categories. This is a comma separated list of categories for the event. The categories can be used to hide events in the Trace Viewer UI.
Optional cnameA fixed color name to associate with the event. If provided, cname must be one of the names listed in trace-viewer's base color scheme's [reserved color names list]https://github.com/catapult-project/catapult/blob/main/tracing/tracing/base/color_scheme.html.
The name of the event, as displayed in Trace Viewer
The event type. This is a single character which changes depending on the type of event being output.
The process ID for the process that output this event.
Optional sThe scope of the event. There are four scopes available global (g), process (p) and thread (t). If no scope is provided we default to thread scoped events.
Optional sfAn id for a stackFrame object in {@see TraceEventJSONObject#stackFrames}
Optional stackA stack is just an array of strings. Mutually exclusive with sf property. The 0th item in the array is the rootmost part of the callstack, the last item is the leafmost entry in the stack, e.g. the closest to what was running when the event was issued. You can put anything you want in each trace, but strings in hex form ("0x1234") are treated as program counter addresses and are eligible for symbolization.
["0x1", "0x2"]
The thread ID for the thread that output this event.
The tracing clock timestamp of the event. The timestamps are provided at microsecond granularity.
Optional ttsOptional. The thread clock timestamp of the event. The timestamps are provided at microsecond granularity.
The instant events correspond to something that happens but has no duration associated with it. For example, vblank events are considered instant events.