how to add more dimensions to all metrics with custom extension?

[tuhao1020]

I want to add some environment variables as dimensions to all metrics of a service, how can I do that with custom extensions?

[mateuszrzeszutek]

If you're using environment variables (which are constant for a single execution of a program), how about adding them to the resource attributes? Resource attributes are attached to all telemetry emitted by the agent, metrics included.

[tuhao1020]

Thanks! I found that the transform processor in the opentelemetry collector meets my requirements