Add documentation for kibana:plugin_render_time

[kpatticha]

Summary

closes https://github.com/elastic/observability-dev/issues/3374

1. Added the section # Report kibana:plugin_render_time metric event.
2. The rest changes are just auto-format

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[kpatticha]

adding @yngrdyn as reviewer, as you might use this in the future. Let me know if anything is missing or unclear

[vigneshshanmugam]

Question. Are we sure its the start of the navigation? Not the Kibana plugin start time ?

[vigneshshanmugam]

What we want is form the browser navigation start time. I am not sure if we are capturing that, If not we need to change the implementation.

[kpatticha]

The performance mark start::pageChange is set on route change and the kibana:plugin_render_time is the duration between the start::pageChange and the end::pageReady.

However, I've noticed that there are more than one markers for start::pageChange per route and the performance.measure gets the latest marker for start::pageChange. it seems to be due to re-render.

kibana/packages/kbn-ebt-tools/src/performance_metrics/context/performance_context.tsx

Line 41 in a4f468b

const interaction = measureInteraction();

I believe I need to fix this.

[vigneshshanmugam]

There is other way to do this, Where you don't need to set marks on mount start/end. To truly measure based on the navigation time, we could do performance.measure("render-time)" this would get the metric between the Nav time and when the page is ready.

Thanks for checking, it seems as you mentioned we need a followup to fix this.

[kpatticha]

we could do performance.measure("render-time)"

Where should we do the performance.measure("render-time) ? I think I missed this part

[kpatticha]

fyi the ticket: https://github.com/elastic/kibana/issues/184390

Feel free to update it

[vigneshshanmugam]

LGTM