user 76301ac8f2 perf: concurrent fetches for multi-instance alert backends ...

Add _fetch_many() helper using ThreadPoolExecutor to query instances
in parallel. Refactors PeerTube, Mastodon, Lemmy, and SearXNG from
sequential to concurrent fetches. Also adds retries parameter to
derp.http.urlopen; multi-instance backends use retries=1 since
instance redundancy already provides resilience.

Worst-case wall time per backend drops from N*timeout to 1*timeout.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-17 12:02:57 +01:00

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