logging – Page 13 – Türker Yıldırım

Alert on symptoms; put the causes on a dashboard

NoteAugust 13, 20192 min read

CPU, memory and disk are causes, and there are unlimited causes — most of them entirely compatible with a healthy system serving every request correctly. The test for…

A dead letter queue with no alert is a bin

NoteAugust 6, 20192 min read

Routing failed messages somewhere they cannot block the main queue is correct design, and it converts a loud failure into a silent one unless something watches the depth.…

Redaction belongs in the shipping pipeline, not the application

NoteJuly 31, 20192 min read

Removing personal data at the call site catches what you thought about; removing it at the shipper catches the debug line somebody adds next year in a code…

Structured logs mean the message is a constant

NoteJuly 31, 20192 min read

Interpolating values into the message produces a unique string per event, so an aggregator sees a million distinct messages rather than one with a million occurrences. The message…

The queue worker that leaked, and the memory limit that hid it

Deep diveJuly 15, 201910 min read

A worker restarting every eleven minutes, reported as healthy. Finding the leak is not the same as bounding it, and the seatbelt hides the next one.

Messenger, and the queue that is part of the framework

Deep diveJune 25, 201910 min read

4.3 made Messenger stable, and dispatch stopped being the same decision as transport. A message, a handler, and routing declared in configuration.

An index template before the first document, or reindex later

NoteJune 12, 20192 min read

Field types are decided by whichever document arrives first, so a field that is an integer in one service and a string in another is rejected in the…

Symfony 4.3 shipped an HTTP client worth using

Deep diveMay 14, 201910 min read

The framework had no client of its own and now it has one with a reason to exist: responses that are lazy by default, and concurrency without a…

Site health, and the plugin that was quietly failing

Deep diveMay 9, 201910 min read

5.2 added a screen that tells you what is wrong, which is new for WordPress. What the checks actually test, and the recovery email nobody receives.

Elasticsearch 7 removed mapping types

Deep diveApril 30, 201910 min read

One type per index in 6, none at all in 7, and every query URL changes. The reindex cannot be done in place — and the default shard…