[APM] [blocked] Display average values in chart legend for relevant time-series

[formgeist]

Summary

Extracted from #84178
Blocked by elastic/elastic-charts#580

We want to display the average value for given charts.

Additionally, the error occurrences chart is displaying the last bucket value rather than average value.

We have this functionality in our current charts implementation, so it's rather confusing not to show it in the new experience and even display values that might be very easily misunderstood, like the error occurrences chart example.

[elasticmachine]

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

[sorenlouv]

@formgeist Instead of displaying the overall average in the legends, we could add a "stat" component similar to the obs overview page.

I think it could confuse users that rest of Kibana shows the last data point in the legend, when we show the average.

[sorenlouv]

If we go ahead and remove the value from the legend can we also tidy the spacing between the legends up? Any reason they are spaced out, instead of being located close together (like before migrating to Elastic charts)?

[markov00]

@sqren they are spaced out because of the default min-width used in the grid layout. We have a meta issue to track the legend redesign (elastic/elastic-charts#580 point 4.) but I can't assure a specific deadline for that

[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.

[sorenlouv]

Just noticed this is marked as stale. It popped up again in #121405.

[formgeist]

@sqren The extra legend component is now available, so I suppose this means we can add the avg. value there elastic/elastic-charts#561

[markov00]

What you can do now is more adding the ability to build your own fully custom legend.
I think you can use that if your chart is relatively straightforward (you know your series and there is no major dynamic change in series names).
We haven't exposed yet a set of legend components (like we have done for the tooltip) but we will do that soon

[formgeist]

We haven't exposed yet a set of legend components (like we have done for the tooltip) but we will do that soon

Sounds like we're better off waiting for those. Do you have an issue open for this that we can track?

[markov00]

We are currently working on adding this capabilities here elastic/elastic-charts#2096