Only set params on router layer

To avoid setting the params in many different spans, potentially
interfering with custom instrumentation on those same params, only
set the params on the router layer.

.changesets/only-set-params-on-router-layer.md

@@ -0,0 +1,6 @@
+---
+bump: "patch"
+type: "fix"
+---
+
+Only set the params on Koa router layer, instead of on all layers.

src/client.ts

@@ -30,6 +30,7 @@ import { RedisDbStatementSerializer } from "./instrumentation/redis/serializer"
 import { RedisInstrumentation as Redis4Instrumentation } from "@opentelemetry/instrumentation-redis-4"
 import { RedisInstrumentation } from "@opentelemetry/instrumentation-redis"
 import { SpanProcessor, TestModeSpanProcessor } from "./span_processor"
+import { KoaLayerType } from "@opentelemetry/instrumentation-koa"
 
 const DefaultInstrumentations = {
   "@opentelemetry/instrumentation-express": ExpressInstrumentation,
@@ -244,7 +245,7 @@ export class Client {
       },
       "@opentelemetry/instrumentation-koa": {
         requestHook: function (_span, info) {
-          if (sendParams) {
+          if (sendParams && info.layerType === KoaLayerType.ROUTER) {
             const queryParams = info.context.request.query
             setParams(queryParams)
           }