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[release-1.27] stats: add bootstrap annotations for stats flush and eviction#3717

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[release-1.27] stats: add bootstrap annotations for stats flush and eviction#3717
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Back port of #3562

This is part of a coordinated backport to back port stats eviction support from Envoy 1.36 / Istio 1.28 to Envoy 1.35 / Istio 1.27, to address unbounded metric memory growth in waypoint proxies. The full set of changes to be back ported across repositories:

…3562)

* add bootstrap annotations

Change-Id: I6c64ddd71aee82b570c7df25f13e2d710a046558
Signed-off-by: Kuat Yessenov <kuat@google.com>

* histogram bin sizes

Change-Id: I245a8b8e70c54ecb4fd36a9d8fffdd0008bc78e9
Signed-off-by: Kuat Yessenov <kuat@google.com>

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Signed-off-by: Kuat Yessenov <kuat@google.com>
Signed-off-by: Ted Poole <tpoole@redhat.com>
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@istio-testing istio-testing added the size/S Denotes a PR that changes 10-29 lines, ignoring generated files. label May 29, 2026
@tedjpoole tedjpoole requested review from kyessenov and zirain May 29, 2026 15:38
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