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[Fuzz task steps duration] Add engine_prepare duration metric - #5569

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brun0-matheus wants to merge 2 commits into
bruno.add-setup-timefrom
bruno.add-engine-prepare-time-metric
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brun0-matheus wants to merge 2 commits into
bruno.add-setup-timefrom
bruno.add-engine-prepare-time-metric

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@brun0-matheus

@brun0-matheus brun0-matheus commented Oct 29, 2026 •

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Bug: b/577957693.
Builds upon PR #5555.

Overview

Tracks the duration of the engine preparation step in fuzz_task main. This field is left empty for the blackbox fuzzing scenario.

I have not implemented this feature in the untrusted_runner scenario because it's legacy, and only a few metrics are lost (in this case, engine_prepare, but any other metric measured inside run_engine_fuzzer will also be lost for the untrusted_runner).

Changes

  • New column added to JobRun.steps_duration schema: engine_prepare.

Tests

Unittests added. Tested in dev environment: https://screenshot-v2.corp.google.com/3tbndcavpbls0 and https://screenshot.corp.google.com/2v5ptet5lcga0

@brun0-matheus
brun0-matheus force-pushed the bruno.add-engine-prepare-time-metric branch from e7022f1 to 908757f Compare November 9, 2026 17:26

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