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Ran 03 Nov 2025 06:06PM UTC

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Committed 03 Nov 2025 06:01PM UTC coverage: 52.477% (+0.09%) from 52.385%

Job # 5019e621bd0188a6dffdc37aa39807f86175f998-PR-174.3

Build Type

Pull #174

github

Committed by

neilberkman

Commit Message

Add OAuth2 token caching for Google Vertex AI

OAuth2 token generation on every request adds 60-180ms overhead
(file I/O, JWT signing, HTTP round trip). Tokens are valid for 1 hour,
so this overhead is wasteful for repeated requests.

Implementation:
- GenServer + ETS cache storing tokens per service account
- 55 minute TTL (5 minute safety margin from 1 hour token lifetime)
- GenServer prevents thundering herd on expiry
- Per-node cache (no distributed coordination needed)

Performance impact:
- Before: 1000 requests = 60-180 seconds auth overhead
- After: 1000 requests = 60-180ms auth overhead (first request only)
- Improvement: 99.9% reduction in auth overhead

Pull Request Pull Request #174: Add OAuth2 token caching for Google Vertex AI

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Source Files on job 5019e621bd0188a6dffdc37aa39807f86175f998-PR-174.3

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