A Composer-managed install where an update through the admin would be silently reverted on the next deploy. Disabling it is correct and the confusion it causes is a…
A documented idempotency contract, and the first consumer to exercise the conflict case. The conflict response is the part of an idempotency contract that has to be specified,…
A rule allowing a port from a specific address, for a service that had been containerised and moved two years earlier. A rule allowing traffic to a closed…
A deploy that invalidates the opcode cache and the application cache simultaneously, and a first minute that is measurably worse. Warming before the health check passes is the…
A handler documented as idempotent since 2022, which was not, and a redelivery that proved it. A docblock claiming idempotency is a claim and not a mechanism, and…
A major distribution release, and a rebuild rather than an upgrade, which took four hours because the provisioning script had been fixed in February. The February exercise is…
One supplier, two API versions running simultaneously during their own migration, and a translation layer built for one shape. The layer had assumed one upstream shape at a…
A second provider, a second trust policy, and a subject claim pattern that was broader than intended. The wildcard is the default in every example and it is…