adding a build_start_time_epoch to build meta info (#61322)
Summary:
Adding a `build_start_time_epoch` as a normal field in scribe reporting.
This should fix https://github.com/pytorch/pytorch/issues/60591.
The decision was made because:
- we would like only one build (test CI job) start time as partition key string
- the alternative is to report the duration on each test case individually which would result in duplicate numeric value upload.
- we would be easily calculate the wall-time of a test job from `MAX('time') - build_start_time_epoch` for all reporting messages with the same normal keys.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61322
Test Plan:
CI should report the extra normal field.
See: https://fburl.com/scuba/pytorch_test_times/pm6chz9w
Reviewed By: driazati
Differential Revision: D29589020
Pulled By: walterddr
fbshipit-source-id: 309fc3b01cbce76cd62f8ccd2eb0ecad27782b88
