test: Fix long running benchmark test and add shimmer.subscribers benchmark test (#3349)

Author: amychisholm03

test/benchmark/Readme.md

@@ -27,13 +27,15 @@ node ./bin/run-bench.js --filename=your-desired-filename
 
 Our benchmark tests now send metrics to New Relic through the OTLP metrics endpoint.
 
-You must provide a `NEW_RELIC_LICENSE_KEY` (specifically a production user license key) in order for the benchmark metrics to be sent. One way to do this is with a `.env`:
+You must provide a `NEW_RELIC_LICENSE_KEY` (specifically an ingest license key) in order for the benchmark metrics to be sent. One way to do this is with a `.env`:
 
 ```zsh
+# Starting at node-newrelic (root directory)
 cd bin
 touch .env
-# NEW_RELIC_LICENSE_KEY=YOUR_PROD_LICENSE_KEY
+# Fill out NEW_RELIC_LICENSE_KEY=YOUR_INGEST_LICENSE_KEY
+# If you are sending metrics to production instead of staging (default), also include: NEW_RELIC_METRICS_HOST=otlp.nr-data.net
 node --env-file .env ./run-bench.js
 ```
 
-The metrics are displayed in [Node Agent Benchmark Test Metrics](https://staging.onenr.io/0ERPpA6ZPRW).
+The metrics are displayed in [Node Agent Benchmark Test Metrics](https://staging.onenr.io/0ERPpA6ZPRW) (staging).

test/benchmark/shimmer/instrumentation.bench.js

@@ -8,13 +8,16 @@
 const benchmark = require('../../lib/benchmark')
 const shimmer = require('../../../lib/shimmer')
 
-const suite = benchmark.createBenchmark({ name: 'shimmer wrapping', delay: 0.01 })
+const suite = benchmark.createBenchmark({ name: 'shimmer wrapping' })
 
 suite.add({
   name: 'shimmer.registerHooks()',
   agent: true,
   fn: function (agent) {
     return shimmer.registerHooks(agent)
+  },
+  after: function() {
+    return shimmer.removeHooks()
   }
 })
 
@@ -30,6 +33,9 @@ suite.add({
   agent: true,
   fn: function (agent) {
     return shimmer.bootstrapInstrumentation(agent)
+  },
+  after: function() {
+    return shimmer.removeHooks()
   }
 })
 

test/benchmark/shimmer/subscribers.bench.js

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2025 New Relic Corporation. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+'use strict'
+
+const benchmark = require('../../lib/benchmark')
+const shimmer = require('../../../lib/shimmer')
+
+const suite = benchmark.createBenchmark({ name: 'shimmer subscribers' })
+
+suite.add({
+  name: 'shimmer.setupSubscribers()',
+  agent: true,
+  fn: function (agent) {
+    return shimmer.setupSubscribers(agent)
+  },
+})
+
+suite.run()