EventHeader is used at run time in 4 crates (of which 1 optionally).

Depender (with downloads and own rev deps) EventHeader version
230 2 eventheader_dynamic =0.4.0
120 tracing-etw >=0.4
110 opentelemetry-user-events-logs ^0.4.0
110 opentelemetry-user-events-metrics =0.4.0