Resolves the trace-export endpoint and credentials as source-aware groups.
The endpoint resolves PHOENIX_COLLECTOR_ENDPOINT first, then the
OTel-standard OTEL_EXPORTER_OTLP_TRACES_ENDPOINT and
OTEL_EXPORTER_OTLP_ENDPOINT, then PHOENIX_ENDPOINT — so a configuration
that names Phoenix once exports spans there rather than silently to
localhost.
Resolves the trace-export endpoint and credentials as source-aware groups.
The endpoint resolves
PHOENIX_COLLECTOR_ENDPOINTfirst, then the OTel-standardOTEL_EXPORTER_OTLP_TRACES_ENDPOINTandOTEL_EXPORTER_OTLP_ENDPOINT, thenPHOENIX_ENDPOINT— so a configuration that names Phoenix once exports spans there rather than silently to localhost.