Opentelemetry_client.Emitter_combineCombine multiple emitters into one.
When to close the combined emitter:
`Close_when_all_closed: closed when all the emitters that are combined are closed`Close_when_one_closed: closed as soon as one of the emitters is closedval combine_l :
?closing:closing_behavior ->
'a Opentelemetry_emitter.Emitter.t list ->
'a Opentelemetry_emitter.Emitter.tval combine :
'a Opentelemetry_emitter.Emitter.t ->
'a Opentelemetry_emitter.Emitter.t ->
'a Opentelemetry_emitter.Emitter.t