monitoring – Page 14 – Türker Yıldırım

The database that was 80% dead rows

Deep diveOctober 4, 202210 min read

180 GB on disk and 41 GB of data. A table that was deleted from daily and never shrank.

Web fonts that stopped blocking the render

Deep diveSeptember 28, 202210 min read

600ms of the largest contentful paint was a font file. font-display: block, and a page that renders in stages.

A collector means the vendor is a configuration change

NoteSeptember 27, 20222 min read

Instrumenting an application against a vendor SDK makes the vendor a dependency in the code; instrumenting against a collector makes it a line in a configuration file. Tail…

The API version that was never going to be removed

Deep diveSeptember 21, 202215 min read

v1, v2 and v3 in production, and v1 has four clients. Every change is made three times.

OpenTelemetry when the PHP SDK is still beta

Deep diveSeptember 20, 202210 min read

The traces specification is 1.0 and the PHP implementation is not. Three tracing formats and a vendor decision nobody wants to make.

Trace context across a queue is carried, never ambient

NoteSeptember 19, 20222 min read

A queue is a process boundary, so the trace context has to travel on the message or the trace ends at the dispatch. The W3C traceparent format is…

A read-through cache that stampedes exactly once

Deep diveAugust 24, 202210 min read

A cache entry expired at 09:00 and four hundred requests recomputed it. A latency spike every hour, exactly on the hour.

An admin surface deserves its own rate limit

NoteAugust 11, 20222 min read

A login form is the highest-value endpoint on the site and is usually governed by the same limit as a product page. The proxy caveat is what makes…

Composer audit, and the advisory that was already fixed

Deep diveAugust 8, 202210 min read

2.4 in August, and an audit command in the tool that already knows. A separate scanner reporting on a lock file it half understood.

CLIENT NO-EVICT, and the connection you must not lose

NoteAugust 5, 20222 min read

When Redis is under memory pressure it evicts client connection buffers, and 7.0 lets a connection opt out of being a candidate. CLIENT NO-TOUCH is the more broadly…