pub const OTEL_EXPORTER_OTLP_TRACES_HEADERS: &str = "OTEL_EXPORTER_OTLP_TRACES_HEADERS";Available on crate feature
trace only.Expand description
Key-value pairs to be used as headers associated with gRPC or HTTP requests
for sending spans.
Example: k1=v1,k2=v2
Note: this is only supported for HTTP.