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Test for a failed clone during split migration #158998

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merged 12 commits into from Jun 5, 2023

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rudolf
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@rudolf rudolf commented Jun 5, 2023

Summary

Adds a test for #158733. This is based on the un-merged #158940, so see the last commit #6eafe910424414b5670e5f325accc59d87dd6dc4 for the actual changes proposed by this PR

Checklist

Delete any items that are not applicable to this PR.

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

For maintainers

@rudolf rudolf added Team:Core Core services & architecture: plugins, logging, config, saved objects, http, ES client, i18n, etc Epic:ScaleMigrations Scale upgrade migrations to millions of saved objects labels Jun 5, 2023
@rudolf rudolf requested a review from a team as a code owner June 5, 2023 07:22
@rudolf rudolf self-assigned this Jun 5, 2023
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Pinging @elastic/kibana-core (Team:Core)

@rudolf rudolf added release_note:skip Skip the PR/issue when compiling release notes backport:prev-minor Backport to the previous minor version (i.e. one version back from main) labels Jun 5, 2023
@rudolf rudolf enabled auto-merge (squash) June 5, 2023 08:22
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Overall LGTM!

client.cluster.putSettings({ persistent: { 'cluster.max_shards_per_node': 20 } });

const { runMigrations: runMigrations2ndTime } = await migratorTestKitFactory();
await runMigrations2ndTime();
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nit, consider wrapping in expect (same for 3rd)

await expect(runMigrations2ndTime()).resolves.toBe(undefined)

await migratorTestKitFactory();

// count of types in the legacy index
expect(await getAggregatedTypesCount(client, '.kibana')).toEqual({
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nit, we can leverage jest, should result in slight better error reporting (same for further down)

await expect(getAggregatedTypesCount(client, '.kibana')).resolves.toEqual({

jloleysens

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💛 Build succeeded, but was flaky

Failed CI Steps

Test Failures

  • [job] [logs] FTR Configs #14 / EPM Endpoints EPM - get Installed Packages Allows the fetching of installed packages

Metrics [docs]

Unknown metric groups

ESLint disabled line counts

id before after diff
enterpriseSearch 19 21 +2
securitySolution 414 418 +4
total +6

Total ESLint disabled count

id before after diff
enterpriseSearch 20 22 +2
securitySolution 498 502 +4
total +6

History

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

cc @rudolf

@rudolf rudolf merged commit 75ec1ec into elastic:main Jun 5, 2023
17 checks passed
kibanamachine pushed a commit to kibanamachine/kibana that referenced this pull request Jun 5, 2023
## Summary

Adds a test for elastic#158733. This is based on the un-merged elastic#158940, so see
the last commit
[#6eafe910424414b5670e5f325accc59d87dd6dc4](elastic@6eafe91)
for the actual changes proposed by this PR

### 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
- [ ] 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: Gerard Soldevila <gerard.soldevila@elastic.co>
(cherry picked from commit 75ec1ec)
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💚 All backports created successfully

Status Branch Result
8.8

Note: Successful backport PRs will be merged automatically after passing CI.

Questions ?

Please refer to the Backport tool documentation

kibanamachine added a commit that referenced this pull request Jun 5, 2023
# Backport

This will backport the following commits from `main` to `8.8`:
- [Test for a failed clone during split migration
(#158998)](#158998)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Rudolf
Meijering","email":"skaapgif@gmail.com"},"sourceCommit":{"committedDate":"2023-06-05T09:24:28Z","message":"Test
for a failed clone during split migration (#158998)\n\n##
Summary\r\n\r\nAdds a test for #158733. This is based on the un-merged
#158940, so see\r\nthe last
commit\r\n[#6eafe910424414b5670e5f325accc59d87dd6dc4](https://github.com/elastic/kibana/commit/6eafe910424414b5670e5f325accc59d87dd6dc4)\r\nfor
the actual changes proposed by this PR\r\n\r\n\r\n###
Checklist\r\n\r\nDelete any items that are not applicable to this
PR.\r\n\r\n- [ ] Any text added follows [EUI's
writing\r\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\r\nsentence case text and includes
[i18n\r\nsupport](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)\r\n-
[
]\r\n[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)\r\nwas
added for features that require explanation or tutorials\r\n- [ ] [Unit
or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n- [ ] Any UI
touched in this PR is usable by keyboard only (learn more\r\nabout
[keyboard accessibility](https://webaim.org/techniques/keyboard/))\r\n-
[ ] Any UI touched in this PR does not create any new axe
failures\r\n(run axe in
browser:\r\n[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),\r\n[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))\r\n-
[ ] If a plugin configuration key changed, check if it needs to
be\r\nallowlisted in the cloud and added to the
[docker\r\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\r\n-
[ ] This renders correctly on smaller devices using a
responsive\r\nlayout. (You can test this [in
your\r\nbrowser](https://www.browserstack.com/guide/responsive-testing-on-local-server))\r\n-
[ ] This was checked for
[cross-browser\r\ncompatibility](https://www.elastic.co/support/matrix#matrix_browsers)\r\n\r\n\r\n###
Risk Matrix\r\n\r\nDelete this section if it is not applicable to this
PR.\r\n\r\nBefore closing this PR, invite QA, stakeholders, and other
developers to\r\nidentify risks that should be tested prior to the
change/feature\r\nrelease.\r\n\r\nWhen forming the risk matrix, consider
some of the following examples\r\nand how they may potentially impact
the change:\r\n\r\n| Risk | Probability | Severity | Mitigation/Notes
|\r\n\r\n|---------------------------|-------------|----------|-------------------------|\r\n|
Multiple Spaces&mdash;unexpected behavior in non-default Kibana
Space.\r\n| Low | High | Integration tests will verify that all features
are still\r\nsupported in non-default Kibana Space and when user
switches between\r\nspaces. |\r\n| Multiple nodes&mdash;Elasticsearch
polling might have race conditions\r\nwhen multiple Kibana nodes are
polling for the same tasks. | High | Low\r\n| Tasks are idempotent, so
executing them multiple times will not result\r\nin logical error, but
will degrade performance. To test for this case we\r\nadd plenty of unit
tests around this logic and document manual testing\r\nprocedure. |\r\n|
Code should gracefully handle cases when feature X or plugin Y
are\r\ndisabled. | Medium | High | Unit tests will verify that any
feature flag\r\nor plugin combination still results in our service
operational. |\r\n| [See more potential
risk\r\nexamples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)
|\r\n\r\n\r\n### For maintainers\r\n\r\n- [ ] This was checked for
breaking API changes and was
[labeled\r\nappropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\r\n\r\n---------\r\n\r\nCo-authored-by:
Gerard Soldevila
<gerard.soldevila@elastic.co>","sha":"75ec1ec7c3b78b3b9ff17874e2c3008079942abd","branchLabelMapping":{"^v8.9.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Core","release_note:skip","backport:prev-minor","Epic:KBNA-7838","v8.9.0"],"number":158998,"url":"#158998
for a failed clone during split migration (#158998)\n\n##
Summary\r\n\r\nAdds a test for #158733. This is based on the un-merged
#158940, so see\r\nthe last
commit\r\n[#6eafe910424414b5670e5f325accc59d87dd6dc4](https://github.com/elastic/kibana/commit/6eafe910424414b5670e5f325accc59d87dd6dc4)\r\nfor
the actual changes proposed by this PR\r\n\r\n\r\n###
Checklist\r\n\r\nDelete any items that are not applicable to this
PR.\r\n\r\n- [ ] Any text added follows [EUI's
writing\r\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\r\nsentence case text and includes
[i18n\r\nsupport](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)\r\n-
[
]\r\n[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)\r\nwas
added for features that require explanation or tutorials\r\n- [ ] [Unit
or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n- [ ] Any UI
touched in this PR is usable by keyboard only (learn more\r\nabout
[keyboard accessibility](https://webaim.org/techniques/keyboard/))\r\n-
[ ] Any UI touched in this PR does not create any new axe
failures\r\n(run axe in
browser:\r\n[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),\r\n[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))\r\n-
[ ] If a plugin configuration key changed, check if it needs to
be\r\nallowlisted in the cloud and added to the
[docker\r\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\r\n-
[ ] This renders correctly on smaller devices using a
responsive\r\nlayout. (You can test this [in
your\r\nbrowser](https://www.browserstack.com/guide/responsive-testing-on-local-server))\r\n-
[ ] This was checked for
[cross-browser\r\ncompatibility](https://www.elastic.co/support/matrix#matrix_browsers)\r\n\r\n\r\n###
Risk Matrix\r\n\r\nDelete this section if it is not applicable to this
PR.\r\n\r\nBefore closing this PR, invite QA, stakeholders, and other
developers to\r\nidentify risks that should be tested prior to the
change/feature\r\nrelease.\r\n\r\nWhen forming the risk matrix, consider
some of the following examples\r\nand how they may potentially impact
the change:\r\n\r\n| Risk | Probability | Severity | Mitigation/Notes
|\r\n\r\n|---------------------------|-------------|----------|-------------------------|\r\n|
Multiple Spaces&mdash;unexpected behavior in non-default Kibana
Space.\r\n| Low | High | Integration tests will verify that all features
are still\r\nsupported in non-default Kibana Space and when user
switches between\r\nspaces. |\r\n| Multiple nodes&mdash;Elasticsearch
polling might have race conditions\r\nwhen multiple Kibana nodes are
polling for the same tasks. | High | Low\r\n| Tasks are idempotent, so
executing them multiple times will not result\r\nin logical error, but
will degrade performance. To test for this case we\r\nadd plenty of unit
tests around this logic and document manual testing\r\nprocedure. |\r\n|
Code should gracefully handle cases when feature X or plugin Y
are\r\ndisabled. | Medium | High | Unit tests will verify that any
feature flag\r\nor plugin combination still results in our service
operational. |\r\n| [See more potential
risk\r\nexamples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)
|\r\n\r\n\r\n### For maintainers\r\n\r\n- [ ] This was checked for
breaking API changes and was
[labeled\r\nappropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\r\n\r\n---------\r\n\r\nCo-authored-by:
Gerard Soldevila
<gerard.soldevila@elastic.co>","sha":"75ec1ec7c3b78b3b9ff17874e2c3008079942abd"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v8.9.0","labelRegex":"^v8.9.0$","isSourceBranch":true,"state":"MERGED","url":"#158998
for a failed clone during split migration (#158998)\n\n##
Summary\r\n\r\nAdds a test for #158733. This is based on the un-merged
#158940, so see\r\nthe last
commit\r\n[#6eafe910424414b5670e5f325accc59d87dd6dc4](https://github.com/elastic/kibana/commit/6eafe910424414b5670e5f325accc59d87dd6dc4)\r\nfor
the actual changes proposed by this PR\r\n\r\n\r\n###
Checklist\r\n\r\nDelete any items that are not applicable to this
PR.\r\n\r\n- [ ] Any text added follows [EUI's
writing\r\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\r\nsentence case text and includes
[i18n\r\nsupport](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)\r\n-
[
]\r\n[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)\r\nwas
added for features that require explanation or tutorials\r\n- [ ] [Unit
or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n- [ ] Any UI
touched in this PR is usable by keyboard only (learn more\r\nabout
[keyboard accessibility](https://webaim.org/techniques/keyboard/))\r\n-
[ ] Any UI touched in this PR does not create any new axe
failures\r\n(run axe in
browser:\r\n[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),\r\n[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))\r\n-
[ ] If a plugin configuration key changed, check if it needs to
be\r\nallowlisted in the cloud and added to the
[docker\r\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\r\n-
[ ] This renders correctly on smaller devices using a
responsive\r\nlayout. (You can test this [in
your\r\nbrowser](https://www.browserstack.com/guide/responsive-testing-on-local-server))\r\n-
[ ] This was checked for
[cross-browser\r\ncompatibility](https://www.elastic.co/support/matrix#matrix_browsers)\r\n\r\n\r\n###
Risk Matrix\r\n\r\nDelete this section if it is not applicable to this
PR.\r\n\r\nBefore closing this PR, invite QA, stakeholders, and other
developers to\r\nidentify risks that should be tested prior to the
change/feature\r\nrelease.\r\n\r\nWhen forming the risk matrix, consider
some of the following examples\r\nand how they may potentially impact
the change:\r\n\r\n| Risk | Probability | Severity | Mitigation/Notes
|\r\n\r\n|---------------------------|-------------|----------|-------------------------|\r\n|
Multiple Spaces&mdash;unexpected behavior in non-default Kibana
Space.\r\n| Low | High | Integration tests will verify that all features
are still\r\nsupported in non-default Kibana Space and when user
switches between\r\nspaces. |\r\n| Multiple nodes&mdash;Elasticsearch
polling might have race conditions\r\nwhen multiple Kibana nodes are
polling for the same tasks. | High | Low\r\n| Tasks are idempotent, so
executing them multiple times will not result\r\nin logical error, but
will degrade performance. To test for this case we\r\nadd plenty of unit
tests around this logic and document manual testing\r\nprocedure. |\r\n|
Code should gracefully handle cases when feature X or plugin Y
are\r\ndisabled. | Medium | High | Unit tests will verify that any
feature flag\r\nor plugin combination still results in our service
operational. |\r\n| [See more potential
risk\r\nexamples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)
|\r\n\r\n\r\n### For maintainers\r\n\r\n- [ ] This was checked for
breaking API changes and was
[labeled\r\nappropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\r\n\r\n---------\r\n\r\nCo-authored-by:
Gerard Soldevila
<gerard.soldevila@elastic.co>","sha":"75ec1ec7c3b78b3b9ff17874e2c3008079942abd"}}]}]
BACKPORT-->

Co-authored-by: Rudolf Meijering <skaapgif@gmail.com>
cqliu1 pushed a commit to cqliu1/kibana that referenced this pull request Jun 5, 2023
## Summary

Adds a test for elastic#158733. This is based on the un-merged elastic#158940, so see
the last commit
[#6eafe910424414b5670e5f325accc59d87dd6dc4](elastic@6eafe91)
for the actual changes proposed by this PR


### 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
- [ ] 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&mdash;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&mdash;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: Gerard Soldevila <gerard.soldevila@elastic.co>
sloanelybutsurely pushed a commit to sloanelybutsurely/kibana that referenced this pull request Jun 6, 2023
## Summary

Adds a test for elastic#158733. This is based on the un-merged elastic#158940, so see
the last commit
[#6eafe910424414b5670e5f325accc59d87dd6dc4](elastic@6eafe91)
for the actual changes proposed by this PR


### 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
- [ ] 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&mdash;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&mdash;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: Gerard Soldevila <gerard.soldevila@elastic.co>
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backport:prev-minor Backport to the previous minor version (i.e. one version back from main) Epic:ScaleMigrations Scale upgrade migrations to millions of saved objects release_note:skip Skip the PR/issue when compiling release notes Team:Core Core services & architecture: plugins, logging, config, saved objects, http, ES client, i18n, etc v8.8.1 v8.9.0
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