Charlie Marsh 87bc50f9d4
Cache OS discovery for user agents and telemetry ( #47038 ) ...
## Why
OS discovery can launch subprocesses on Linux. Repeating it for requests, analytics events, and metrics provider creation adds unnecessary work for stable metadata.
## What changed
Cache `os_info::get()` with a separate `LazyLock` in user-agent generation, analytics runtime metadata, and metrics OS resource attributes. Continue reading the user-agent originator and suffix on each call so updates remain effective.
## Testing
Add an isolated Linux regression test that races initial user-agent lookups and repeats calls, verifies `lsb_release` and `getconf` each run once, and checks that subsequent originator and suffix updates appear in the user agent.
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Charlie Marsh
87bc50f9d4