Observability. How to collect the logs, metrics and traces you need, set up OpenTelemetry, and keep the bill under control as you grow.

Observability is the logs, metrics and traces that let you answer a new question about production without shipping new code. Getting it right means collecting the signals you need, keeping them connected and keeping the bill under control as traffic grows.

These guides are for engineers setting up or cleaning up observability for a production app. They cover OpenTelemetry instrumentation, structured logging, sampling, retention and how to send data to the tools you already use. Each one shows the configuration to copy and how to check that the data arrives in a form you can query in the middle of an incident.

How Polylane works on these platforms: Vercel and Cloudflare.