Custom Plugins with Zipkin Tracing

Questions
1

Hi,

I want to measure the time spent by my custom plugins on the tracing spans (rewrite, acess, balance, header .filter and body.filter).

Any idea for that?

2

is it already possible with open telemetry?

here is an example with post-function plugin: OpenTelemetry | Kong Docs

I just want to understand if is it possible with other custom plugins