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src/services/tracing
Etienne Pierre-doray 226632b457 [tracing] Plumb event id between histogram samples, slices and triggers.
This CL adds a histogram scoper to connect flow id to observers,
to links histogram samples to semantically related events in tracing.
This is more robust and extensible than the previous solution
based on hashing histogram names.

Bug: 40257548
Change-Id: Ib1d5d5da42c84ff548a16b622f8932eb5dd206ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6233616
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: Giovanni Ortuno Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1418857}
2025-02-11 12:51:21 -08:00
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