Tracing: Allow otel service name and attributes to be overridden from env (#85937)

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

docs/sources/setup-grafana/configure-grafana/_index.md

@@ -1925,7 +1925,7 @@ Configure general parameters shared between OpenTelemetry providers.
 
 Comma-separated list of attributes to include in all new spans, such as `key1:value1,key2:value2`.
 
-Can be set with the environment variable `OTEL_RESOURCE_ATTRIBUTES` (use `=` instead of `:` with the environment variable).
+Can be set or overridden with the environment variable `OTEL_RESOURCE_ATTRIBUTES` (use `=` instead of `:` with the environment variable). The service name can be set or overridden using attributes or with the environment variable `OTEL_SERVICE_NAME`.
 
 ### sampler_type
 

pkg/infra/tracing/tracing.go

@@ -209,6 +209,7 @@ func initTracerProvider(exp tracesdk.SpanExporter, serviceName string, serviceVe
 			semconv.ServiceVersionKey.String(serviceVersion),
 		),
 		resource.WithAttributes(customAttribs...),
+		resource.WithFromEnv(),
 		resource.WithProcessRuntimeDescription(),
 		resource.WithTelemetrySDK(),
 	)