alt Hacker NewsI am not sure if this is what they mean, but e.g. with Micrometer in Java you can instrument your code once with observations that produces observation events, then you can register handlers that can turn them into metrics, or logs, or traces without having to instrument your code three times.
https://docs.micrometer.io/micrometer/reference/observation....
The problem is not the instrumentation but the way everyone of them work.
A metric is a point in time. A metric is very small but you have a lot of them.
A log is when something is happening but you need to log it out. A logline is heavy and has a lot of context. User id, message, etc.
A trace needs to start at the request level and tracing until the response. This is the slowest and heaviest operation.
How do you decide when to suddenly do the trace and send it? IF you always do the trace, you have to pay for the overhead of that tracing constantly.