Readiness probes are necessary for Kubernetes zero-downtime rollouts, but they only close one of four gaps. Here is what actually drops requests during a deploy: the race between SIGTERM and endpoint propagation, probes that lie, surge settings that quietly delete capacity, and load balancers that never watched EndpointSlices in the first place.
"It works" and "it's ready" are different claims. Integrations rarely fail on launch day; they fail in week six, when the token expires and someone adds a field. A readiness checklist for Salesforce AWS integrations, with a pass test on every item.
A PersistentVolumeClaim sounds like paperwork. Delete one on a cluster with the default reclaim policy and the underlying disk goes with it. A short guide to the parts of Kubernetes storage that bite: reclaim policies, access modes, zone affinity and StatefulSets.
Three hours into an ingress controller upgrade for an application that is one Go binary and a Postgres database. Nothing is broken. The cluster has just become the thing you operate. An honest look at what Kubernetes costs, when it earns that cost, and what to run instead.
The error count was zero every day for three weeks. So was the invocation count. A stopped integration and a healthy one produce identical graphs, and every CloudWatch default is tuned to stay quiet when data stops arriving. Four signals worth emitting, and the alarm config that actually fires.
Loki was fast until someone added one more label. Now queries time out during incidents and the index no longer fits in memory. Here's the model you have to internalise, what replaced Promtail, and how to keep labels, retention and storage costs under control.
A green pipeline that ships a broken build is worse than a red one. Here is how to order stages so failures surface in seconds, stop shell pipes from swallowing exit codes, and write failure output that tells the next engineer exactly what to fix.
Metrics tell you that something is wrong. Traces tell you where. Logs tell you why. Use them in that order and each step narrows the search — start with logs and you are grepping a firehose. Here is what each one is actually for, and the field that connects all three.