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#sre — Jot

sre

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DW
Dan Whitlock
23d ago

The on-call handover I have used for nine years

The plain text block I hand over with. Every field, why it is there, and the two I deleted, one of which I put in myself and should not have.

field-notessretools
★stars: 34 min read
DW
Dan Whitlock
05 Jun 2026

It is always DNS, but here is the actual reason

Why DNS breaks things out of proportion to its size, with real dig output read line by line, plus the four commands I run to prove it is not DNS.

debuggingdnssre
★stars: 36 min read
DW
Dan Whitlock
19 Feb 2026

EXPLAIN ANALYZE has never lied to me

A support query that took 13.8 seconds, a report that timed out at 300, and a fix that turned out to be statistics rather than an index. Real plans, Postgres 18.2.

debuggingmeasurementpostgres
★stars: 127 min read
DW
Dan Whitlock
17 Nov 2025

Postmortem: 43 minutes of 502s and one very confident regex

Our gateway returned 502 for forty three minutes because of a regex I would have approved too. Full timeline, the pattern, and the dashboard that lied to me.

debuggingpostmortemsre
★stars: 79 min read

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