Merge pull request #728 from newrelic/release/v7.3.0

Release v7.3.0

NEWS.md

@@ -1,3 +1,15 @@
+### v7.3.0 (2021-04-06)
+
+* Added new feature-flag 'new_promise_tracking' which enables cleaning up of segment references on native promise resolve instead of destroy. Includes usage of async-await. This can be enabled via `feature_flag: { new_promise_tracking: true }` in the config file or `NEW_RELIC_FEATURE_FLAG_NEW_PROMISE_TRACKING=1` in your ENV vars.
+
+  Applications with heavy promise usage or high-throughput applications with some promise usage should see moderate to high reduction in memory usage and may see a slight reduction in CPU usage. A bump in throughput may also be noticed in some cases. Results will vary by application.
+
+  If you are experiencing high overhead levels with your promise usage and the agent attached, we recommend testing your application with  'new_promise_tracking' set to true to see if overhead is reduced. You'll also want to verify your data is still being captured correctly in case it falls into a known or unknown limitation of this approach.  **NOTE: chaining of promise continuations onto an already resolved promise across an async hop (scheduled timer) will result in state-loss with this new functionality turned on. This is a less-common use-case but worth considering with your applications.**
+
+* Fixed memory leak introduced when Infinite Tracing is enabled.
+
+  When Infinite Tracing endpoints reconnected they would instantiate a new gRPC client prior to calling `client.recordSpan()`. It appears several objects created by grpc-js (`ChannelImplementation` and child objects, promises, etc.) are held in memory indefinitely due to scheduled timers even when the client is no-longer referenced and the associated stream closed. We now avoid this situation by only creating the client once and then reusing it to establish new stream connections.
+
 ### v7.2.1 (2021-03-29)
 
 * Dev-only sub-dependency bump of 'y18n' to clear npm audit warnings.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "newrelic",
-  "version": "7.2.1",
+  "version": "7.3.0",
   "author": "New Relic Node.js agent team <nodejs@newrelic.com>",
   "license": "Apache-2.0",
   "contributors": [