Ignore false positives log requests
Summary:
The [component] message log format triggers some false positive:
- for mailing list subjects
- for date or time logs
Two strategies are used to avoid them:
- a blacklist for ML subjects
- a pattern detection to ignore components starting by spaces or digits
Test Plan: Tests are provided for encountered cases.
Reviewers: dereckson
Reviewed By: dereckson
Subscribers: ledesillusionniste
Differential Revision: https://devcentral.nasqueron.org/D1591