· 5 min read
Aurora's writer endpoint can lie to you
CloudWatch measures instances. Your application talks to endpoints. For the minute those disagree, every instance metric looks healthy while writes fail.
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#monitoring
· 5 min read
PostgreSQL 18 moved the WAL I/O counters
pg_stat_wal lost its write and sync columns to pg_stat_io in 18. Nothing errors. The numbers just stop arriving, and most monitoring never notices.
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