telemetry: make count logic faster (#5013)

Author: tlhunter

packages/dd-trace/src/telemetry/logs/index.js

@@ -40,6 +40,7 @@ function onErrorLog (msg) {
 
   const telLog = {
     level: 'ERROR',
+    count: 1,
 
     // existing log.error(err) without message will be reported as 'Generic Error'
     message: message ?? 'Generic Error'

packages/dd-trace/src/telemetry/logs/log-collector.js

@@ -79,7 +79,7 @@ const logCollector = {
       }
       const hash = createHash(logEntry)
       if (!logs.has(hash)) {
-        logs.set(hash, errorCopy(logEntry))
+        logs.set(hash, logEntry)
         return true
       } else {
         logs.get(hash).count++
@@ -122,19 +122,6 @@ const logCollector = {
   }
 }
 
-// clone an Error object to later serialize and transmit
-// { ...error } doesn't work
-// also users can add arbitrary fields to an error
-function errorCopy (error) {
-  const keys = Object.getOwnPropertyNames(error)
-  const obj = {}
-  for (const key of keys) {
-    obj[key] = error[key]
-  }
-  obj.count = 1
-  return obj
-}
-
 logCollector.reset()
 
 module.exports = logCollector

packages/dd-trace/test/telemetry/logs/log-collector.spec.js

@@ -128,11 +128,9 @@ describe('telemetry log collector', () => {
     })
 
     it('duplicated errors should send incremented count values', () => {
-      const err1 = new Error('oh no')
-      err1.level = 'ERROR'
+      const err1 = { message: 'oh no', level: 'ERROR', count: 1 }
 
-      const err2 = new Error('foo buzz')
-      err2.level = 'ERROR'
+      const err2 = { message: 'foo buzz', level: 'ERROR', count: 1 }
 
       logCollector.add(err1)
       logCollector.add(err2)