[APM] Latency correlations 7.15 meta issue

[walterra]

Meta issue detailing improvements for 7.15 to the Latency correlations feature added in 7.14 in #99905.

Must have

Covered by #107370

• Introduce prioritization to query field/value candidates based on a hard coded list of fields
• Make use of the includeFrozen request attribute

---

Covered by #107266

• Move fly-out components to latency correlation panel
• Remove top nav “View Correlations” button
• Analysis workflow
  • On page load just fetch the overall histogram for trace samples
  • Add tabs for user to initiate analysis by getting correlations/errors
• Implement selection in the log log chart to update traces information

---

• Automatically rerun analysis for updated time ranges
  [ML] APM Latency Correlations UX improvements/fixes #108860
• Filtering will move the user to the top of the page to indicate that the filter has been applied to KQL, the lower page will reset to the default tab Trace samples
  [ML] APM Latency Correlations UX improvements/fixes #108860

Should have

• Base Exception correlations on new p_value sig term
  [ML] Replace APM error rate table with failed transactions correlations #108441
• Improve wording when no significant correlations were found
• Filters added using special chars are not formatted correctly in the query bar. If you add a filter for a url.path it doesn't return any results in the data because the formatting from clicking the filter value option in the table wasn't correct.
  [ML] Fix UI inconsistencies in APM Failed transaction correlations #109187

Could have

• move function* fetchTransactionDurationHistograms() to its own file and cover it with unit tests
  [ML] APM Latency Correlations: Field/value candidates prioritization #107370
• remove legacy code of pre-7.14 feature version (e.g. orphaned components, API endpoints)
  • x-pack/plugins/apm/public/components/app/correlations/index.tsx
  • x-pack/plugins/apm/public/components/app/transaction_details/Distribution/*
  • x-pack/plugins/apm/server/lib/transactions/distribution/*
• improve y axis ticks
  [ML] APM Latency Correlations: Improve log log chart loading behavior and axis ticks. #108211
• improve x axis ticks and tooltip values for the log log chart for values below 0.1s
• Revisit code that generates ticks for the log log chart's x axis, see
  [ML] APM Latency Correlations: Improve log log chart loading behavior and axis ticks. #108211 (comment)
  [ML] APM Latency Correlations: Fix formatting of duration values for log x axis and selection badge. #109214

Clarify / Tests

• Needs once more validating against python results -> no longer applicable since we dont' display overall latency correlations
• Is the filter in the query bar carried forward into the correlation calculation? Should it be? -> The filter applies to the whole page, so yes
• Correlations for monitor service in anti-fraud hangs at 10% for date range 23-May-2021 00:00 to 30-May-2021 23:30 (but it works if I extend the time to 31-May-2021 00:00) -> couldn't reproduce on post 7.15 FF master branch

[elasticmachine]

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

[elasticmachine]

Pinging @elastic/ml-ui (:ml)