Opentelemetry_client.Exporter_combineCombine multiple exporters into one
val combine_l :
Opentelemetry_client.Common_.OTEL.Exporter.t list ->
Opentelemetry_client.Common_.OTEL.Exporter.tval combine :
Opentelemetry_client.Common_.OTEL.Exporter.t ->
Opentelemetry_client.Common_.OTEL.Exporter.t ->
Opentelemetry_client.Common_.OTEL.Exporter.tcombine exp1 exp2 is the exporter that emits signals to both exp1 and exp2.