fix: use environment variable for service name

Author: wopian

src/otel.js

@@ -11,7 +11,7 @@ const traceExporter = new OTLPTraceExporter({
 
 const sdk = new NodeSDK({
 	resource: new Resource({
-		[ATTR_SERVICE_NAME]: "postgraphile",
+		[ATTR_SERVICE_NAME]: process.env.OPENTELEMETRY_SERVICE_NAME || "postgraphile",
 	}),
 	traceExporter,
 	instrumentations: [getNodeAutoInstrumentations()],

src/plugins/tracerPlugin.js

@@ -53,7 +53,7 @@ export const tracePlugin = function CustomPlugin(builder) {
 		return {
 			...field,
 			async resolve(parent, args, context, info) {
-				const tracer = trace.getTracer("postgraphile")
+				const tracer = trace.getTracer(process.env.OPENTELEMETRY_SERVICE_NAME || "postgraphile")
 
 				return tracer.startActiveSpan(fieldName, async (span) => {
 					try {