user da908a45e4 fix: track alert backend errors independently ...

Per-backend error counts with exponential backoff: after 5 consecutive
failures a backend is skipped every 2^(n-5) cycles (capped at 32).
Working backends are no longer penalized by one flaky backend doubling
the entire poll interval.

Migrates last_error (string) to last_errors (dict per backend).

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

2026-02-17 10:51:42 +01:00

68 KiB

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