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policy: add metric on selector cache cardinality and performance#42872

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odinuge:odinuge/selector-cache-count
Dec 18, 2025
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policy: add metric on selector cache cardinality and performance#42872
aanm merged 1 commit intocilium:mainfrom
odinuge:odinuge/selector-cache-count

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@odinuge odinuge commented Nov 19, 2025 •
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This adds a new set of metrics for the selector cache. Both in terms of cardinality, but also around the performance of various operations.

Mostly opening now so we can start discussing performance around #42008. The same applies to #42580, so that we can add a separate type="subject" value.

I'm don't think we need a histogram here, and that a summary (_count + _sum) is sufficient, but can't see that used elsewhere.

$ k get --raw /api/v1/namespaces/kube-system/pods/http:<pod-name>:9962/proxy/metrics | egrep "^cilium_policy_selector_cache"
cilium_policy_selector_cache_identities{type="peer"} 13
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.0005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.001"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.025"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.05"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.2"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.4"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="+Inf"} 2
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="add_selector",scope="operation",type="peer"} 3.0375e-05
cilium_policy_selector_cache_operation_duration_seconds_count{operation="add_selector",scope="operation",type="peer"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.0005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.001"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.025"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.05"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.2"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.4"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="+Inf"} 2
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="identity_updates",scope="lock",type="peer"} 8.2e-08
cilium_policy_selector_cache_operation_duration_seconds_count{operation="identity_updates",scope="lock",type="peer"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.0005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.001"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.025"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.05"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.2"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.4"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="+Inf"} 2
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="identity_updates",scope="operation",type="peer"} 8.612499999999999e-05
cilium_policy_selector_cache_operation_duration_seconds_count{operation="identity_updates",scope="operation",type="peer"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.0005"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.001"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.005"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.025"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.05"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.1"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.2"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.4"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="+Inf"} 4
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="remove_selector",scope="operation",type="peer"} 2.4376000000000002e-05
cilium_policy_selector_cache_operation_duration_seconds_count{operation="remove_selector",scope="operation",type="peer"} 4
cilium_policy_selector_cache_selectors{type="peer"} 2
n/a yet.

@maintainer-s-little-helper maintainer-s-little-helper bot added the dont-merge/needs-release-note-label The author needs to describe the release impact of these changes. label Nov 19, 2025
@github-actions github-actions bot added the sig/policy Impacts whether traffic is allowed or denied based on user-defined policies. label Nov 19, 2025
@odinuge odinuge mentioned this pull request Nov 19, 2025
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odinuge commented Dec 1, 2025

Added some more metrics now;

(⎈|kind-kind-cilium:N/A)❯ k get --raw /api/v1/namespaces/kube-system/pods/http:cilium-2hz6s:9962/proxy/metrics |egrep "^cilium_policy_selector_cache"
WARNING: TELEPORT_CLUSTER variable is not set, did you run tshlogin?
cilium_policy_selector_cache_identities{type="peer"} 13
cilium_policy_selector_cache_operation_count{operation="add_selector",type="peer"} 2
cilium_policy_selector_cache_operation_count{operation="identity_updates",type="peer"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.01"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.025"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.05"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.25"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.5"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="2.5"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="5"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="10"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="+Inf"} 2
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="identity_updates",scope="lock",type="peer"} 2.5e-07
cilium_policy_selector_cache_operation_duration_seconds_count{operation="identity_updates",scope="lock",type="peer"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.01"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.025"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.05"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.25"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.5"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="2.5"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="5"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="10"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="+Inf"} 2
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="identity_updates",scope="operation",type="peer"} 0.000106207
cilium_policy_selector_cache_operation_duration_seconds_count{operation="identity_updates",scope="operation",type="peer"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="0.005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="0.01"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="0.025"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="0.05"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="0.1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="0.25"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="0.5"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="2.5"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="5"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="10"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="total",type="peer",le="+Inf"} 2
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="identity_updates",scope="total",type="peer"} 0.000100791
cilium_policy_selector_cache_operation_duration_seconds_count{operation="identity_updates",scope="total",type="peer"} 2
cilium_policy_selector_cache_selectors{type="peer"} 2

They are a bit duplicative, so It would probably be better to get them into two. I'm also not sure we really need a histogram here, and maybe a summary (_sum + _count) could work equally good?

Its also hard to measure the time it takes for selector upserts and removals, since the AddIdentitySelector is often executed 10s of thousands of times a/sec on busy nodes - and we don't really want to measure all of them.. The lock contention on the identity_updates will show us how much contention there is.

I think we can mesure the time it takes inside of addSelectorLocked for selector upserts but that would be without accounting for the lock, but the corresponding removal is pretty hard to measure? If we could measure both it would also be easier to remove the cilium_policy_selector_cache_operation_count metric and only keep the histogram/summary.

What do you think @christarazi ?

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odinuge commented Dec 1, 2025 

cilium_policy_selector_cache_identities{type="peer"} 13
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.0005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.001"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.025"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.05"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.2"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="0.4"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="add_selector",scope="operation",type="peer",le="+Inf"} 2
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="add_selector",scope="operation",type="peer"} 3.0375e-05
cilium_policy_selector_cache_operation_duration_seconds_count{operation="add_selector",scope="operation",type="peer"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.0005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.001"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.025"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.05"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.2"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="0.4"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="lock",type="peer",le="+Inf"} 2
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="identity_updates",scope="lock",type="peer"} 8.2e-08
cilium_policy_selector_cache_operation_duration_seconds_count{operation="identity_updates",scope="lock",type="peer"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.0005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.001"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.005"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.025"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.05"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.1"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.2"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="0.4"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="identity_updates",scope="operation",type="peer",le="+Inf"} 2
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="identity_updates",scope="operation",type="peer"} 8.612499999999999e-05
cilium_policy_selector_cache_operation_duration_seconds_count{operation="identity_updates",scope="operation",type="peer"} 2
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.0005"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.001"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.005"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.025"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.05"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.1"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.2"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="0.4"} 4
cilium_policy_selector_cache_operation_duration_seconds_bucket{operation="remove_selector",scope="operation",type="peer",le="+Inf"} 4
cilium_policy_selector_cache_operation_duration_seconds_sum{operation="remove_selector",scope="operation",type="peer"} 2.4376000000000002e-05
cilium_policy_selector_cache_operation_duration_seconds_count{operation="remove_selector",scope="operation",type="peer"} 4
cilium_policy_selector_cache_selectors{type="peer"} 2

Okay, so I think ^ is a decent middleground. That only counts the lock for identity updates, but checks the full length of selector inserts and removals. When adding a second selector cache, we can do type=subject for those - and we get twice as many metrics.

@odinuge odinuge force-pushed the odinuge/selector-cache-count branch 2 times, most recently from a6e358c to 120eaed Compare December 3, 2025 10:31
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odinuge commented Dec 3, 2025

/test

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odinuge commented Dec 3, 2025

/ci-integration

@odinuge odinuge marked this pull request as ready for review December 3, 2025 12:27
@odinuge odinuge requested a review from a team as a code owner December 3, 2025 12:27
@odinuge odinuge requested a review from nebril December 3, 2025 12:27
@odinuge odinuge changed the title policy: add metric on selector cache cardinality policy: add metric on selector cache cardinality and performance Dec 3, 2025
@odinuge odinuge mentioned this pull request Dec 3, 2025
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@nebril nebril requested a review from christarazi December 4, 2025 10:48
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christarazi commented Dec 4, 2025

This looks great to me @odinuge!

@christarazi christarazi added area/metrics Impacts statistics / metrics gathering, eg via Prometheus. release-note/misc This PR makes changes that have no direct user impact. labels Dec 8, 2025
@maintainer-s-little-helper maintainer-s-little-helper bot removed dont-merge/needs-release-note-label The author needs to describe the release impact of these changes. labels Dec 8, 2025
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odinuge commented Dec 11, 2025 •
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Getting conflicts and test failures after #43237 #42992, so hopefully we can merge #43237 soon to unblock the tests and get rid of the conflict.

@maintainer-s-little-helper maintainer-s-little-helper bot added the ready-to-merge This PR has passed all tests and received consensus from code owners to merge. label Dec 11, 2025
@christarazi christarazi added the dont-merge/needs-rebase This PR needs to be rebased because it has merge conflicts. label Dec 15, 2025
@odinuge odinuge force-pushed the odinuge/selector-cache-count branch from 120eaed to e2574df Compare December 16, 2025 09:08
@odinuge-work
policy: add selector cache metrics
224438e 
This adds a new set of metrics for the selector cache. Both in terms of cardinality,
but also around the performance of various operations.

Contention in the selector cache can easily make regenerations slower,
and potentially grind the whole agent to a halt in special cases. This
allows us to use these metrics to better observe the performance of
these operations.

Signed-off-by: Odin Ugedal <[email protected]>
Signed-off-by: Odin Ugedal <[email protected]>
@odinuge odinuge force-pushed the odinuge/selector-cache-count branch from e2574df to 224438e Compare December 16, 2025 09:09
@aanm aanm enabled auto-merge December 16, 2025 09:53
@aanm aanm removed ready-to-merge This PR has passed all tests and received consensus from code owners to merge. dont-merge/needs-rebase This PR needs to be rebased because it has merge conflicts. labels Dec 16, 2025
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aanm commented Dec 16, 2025

/test

@maintainer-s-little-helper maintainer-s-little-helper bot added the ready-to-merge This PR has passed all tests and received consensus from code owners to merge. label Dec 16, 2025
@aanm aanm requested a review from christarazi December 17, 2025 08:35
@aanm aanm removed the ready-to-merge This PR has passed all tests and received consensus from code owners to merge. label Dec 17, 2025
@aanm aanm added this pull request to the merge queue Dec 18, 2025
@maintainer-s-little-helper maintainer-s-little-helper bot added the ready-to-merge This PR has passed all tests and received consensus from code owners to merge. label Dec 18, 2025
Merged via the queue into cilium:main with commit c83ca70 Dec 18, 2025
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@cilium-release-bot cilium-release-bot bot moved this to Released in cilium v1.19.0 Feb 3, 2026
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area/metrics Impacts statistics / metrics gathering, eg via Prometheus. ready-to-merge This PR has passed all tests and received consensus from code owners to merge. release-note/misc This PR makes changes that have no direct user impact. sig/policy Impacts whether traffic is allowed or denied based on user-defined policies.

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