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[8.x] [Synthetics] Fix issue where heatmap UI crashes on undefined histogram data (#192508)#193154

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kibanamachine merged 1 commit intoelastic:8.xfrom
kibanamachine:backport/8.x/pr-192508
Sep 17, 2024
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[8.x] [Synthetics] Fix issue where heatmap UI crashes on undefined histogram data (#192508)#193154
kibanamachine merged 1 commit intoelastic:8.xfrom
kibanamachine:backport/8.x/pr-192508

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Backport

This will backport the following commits from main to 8.x:

Questions ?

Please refer to the Backport tool documentation

…m data (elastic#192508)

## Summary

Recently, [we fixed](elastic#184177) an
[issue](elastic#180076) where the
heatmap data on the detail and monitor history pages would not fill up.

A side effect of this fix was a new regression that caused certain rarer
cases to see the page crash because of an unhandled case of calling a
function on a potentially-null object; our histogram data used to
populate this heatmap can be `undefined` in certain cases.

This patch introduces a change that will handle this case, and adds unit
tests for the module in question.

### Checklist

Delete any items that are not applicable to this PR.

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [ ] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [ ] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)

### Risk Matrix

Delete this section if it is not applicable to this PR.

Before closing this PR, invite QA, stakeholders, and other developers to
identify risks that should be tested prior to the change/feature
release.

When forming the risk matrix, consider some of the following examples
and how they may potentially impact the change:

| Risk | Probability | Severity | Mitigation/Notes |

|---------------------------|-------------|----------|-------------------------|
| Multiple Spaces—unexpected behavior in non-default Kibana Space.
| Low | High | Integration tests will verify that all features are still
supported in non-default Kibana Space and when user switches between
spaces. |
| Multiple nodes—Elasticsearch polling might have race conditions
when multiple Kibana nodes are polling for the same tasks. | High | Low
| Tasks are idempotent, so executing them multiple times will not result
in logical error, but will degrade performance. To test for this case we
add plenty of unit tests around this logic and document manual testing
procedure. |
| Code should gracefully handle cases when feature X or plugin Y are
disabled. | Medium | High | Unit tests will verify that any feature flag
or plugin combination still results in our service operational. |
| [See more potential risk
examples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx) |

### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: Shahzad <shahzad31comp@gmail.com>
(cherry picked from commit da2f7f6)
@kibanamachine kibanamachine added the backport This PR is a backport of another PR label Sep 17, 2024
@kibanamachine kibanamachine enabled auto-merge (squash) September 17, 2024 12:13
@botelastic botelastic Bot added ci:project-deploy-observability Create an Observability project Team:actionable-obs Formerly "obs-ux-management", responsible for SLO, o11y alerting, significant events, & synthetics. labels Sep 17, 2024
@elasticmachine
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Pinging @elastic/obs-ux-management-team (Team:obs-ux-management)

@kibana-ci
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💛 Build succeeded, but was flaky

Failed CI Steps

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id before after diff
synthetics 963.4KB 963.5KB +58.0B

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @justinkambic

@kibanamachine kibanamachine merged commit c9c3e89 into elastic:8.x Sep 17, 2024
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