refactor: Delegate otlp_protocol to standard OTLP env variables

conduwuit-example.toml

@@ -823,7 +823,7 @@
 # Jaeger) that supports the OpenTelemetry Protocol.
 #
 # Configure your OTLP endpoint using the OTEL_EXPORTER_OTLP_ENDPOINT
-# environment variable (defaults to http://localhost:4318).
+# environment variable, or OTEL_EXPORTER_OTLP_TRACES_ENDPOINT (defaults to http://localhost:4318), and OTEL_EXPORTER_OTLP_PROTOCOL for the protocol.
 #
 #allow_otlp = false
 
@@ -832,13 +832,10 @@
 #
 #otlp_filter = "info"
 
-# Protocol to use for OTLP tracing export. Options are "http" or "grpc".
-# The HTTP protocol uses port 4318 by default, while gRPC uses port 4317.
-#
-#otlp_protocol = "http"
-
-# Enable OpenTelemetry OTLP metrics export, using the same endpoint and
-# `otlp_protocol` as traces.
+# Enable OpenTelemetry OTLP metrics export. Configure your OTLP endpoint
+# and protocol using standard OpenTelemetry environment variables
+# (such as OTEL_EXPORTER_OTLP_ENDPOINT, OTEL_EXPORTER_OTLP_PROTOCOL and
+# OTEL_EXPORTER_OTLP_METRICS_PROTOCOL).
 #
 # The export interval can be changed with the
 # OTEL_METRIC_EXPORT_INTERVAL environment variable (milliseconds,