Difference between Counter and Observable Counter

[probaku1234]

Hello

I'm experimenting with open telemetry in NodeJS.
What's the difference between Counter and Observable Counter?

[dyladan]

The counter is meant to be called when something happens. For example, you may increment it each time a request comes in. The observable counter periodically observes something. For example you may once per second check the number of network packets that have been sent or received.