[Observability] Homepage Log rate metrics

[felixbarny]

An idea for a follow-up on #68176

Instead of showing the log rate for the top 5 log categories, we could move them to the legend.

This would allow us to show more high-level metrics above the graph that are not specific to a log category such as:

• Total log rate
• Count of unique log categories (roughly similar to number of APM services)

As the number of log categories can get quite high when lots of applications send data, showing just the top 5 log rates doesn't give a clear picture about the total log rate. Also, showing both, the total log rate and the log rate of the top 5 categories in the same section might be confusing as it would mix both global and segregated KPIs.

An additional layout-related challenge is the unbounded nature of the log categories. There could be hundreds. All other panels in the Observability overview don't have a dynamic number of legend entries.

/cc @formgeist @cyrille-leclerc

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)

[sorenlouv]

showing both, the total log rate and the log rate of the top 5 categories in the same section might be confusing as it would mix both global and segregated KPIs.

Agree

Count of unique log categories

Good idea. Since we currently only show the top 5 categories there's no way to see how many categories are left out. This would fix that.

[sorenlouv]

@formgeist Do we need a design for this?

[cauemarcondes]

@formgeist are we still doing it for 7.10?

[formgeist]

@cauemarcondes AFAIK we didn't want to do any improvements to the Homepage until the next release cycle, because we're awaiting user feedback to help us guide the roadmap of where we want to spend our efforts next. @cyrille-leclerc What do you think?

[cyrille-leclerc]

Thanks, as @formgeist said, we will use the 7.10 iteration to getting user feedback and defining the next improvement.

[botelastic]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.