Metrics
The requests, errors and response times of each version, counted by while, with nothing to add to your code.
Updated November 9, 2026.
You, to your agent: Tell me if the new version responds more slowly than the old one.
When to use it
Use it to follow the traffic, errors and latency of each version, without adding anything to the code.
How it works
while counts the requests, errors and response times of each version, without instrumenting anything. They are queried in PromQL.
Your agent’s MCP tools
Your agent handles it with the observe_app tool.