Node.js agent release notesRSS

Notes

• Fixed a bug in native ES6 Promise instrumentation.

  Previously the Promise instrumentation would cause instanceof Promise to return false even if the object was a promise. This also caused an incompatibility with async-listener. instanceof checks will now work on both the wrapped and unwrapped Promise object.

Features

• Filesystem interactions are now recorded in metrics

  The time spent in filesystem functions during a transaction will now be displayed in the transaction overview page per operation.

Bugfixes

• Fixed a bug with error handling.

  Previously the agent could crash applications in certain situations where null was thrown rather than an Error object.

Bug fixes

• Fixed a bug in environment variable based configuration.

  Previously the agent would parse the NEW_RELIC_APDEX environment variable as a string rather than a float this could cause data to be sent to New Relic servers in an invalid format, preventing the data from being collected.

• Fixed a bug with the error collector's handling of ignored status codes.

  Previously the agent would not properly ignore status codes if the status code was set using a string rather than a number.

• Fixed a bug in mysql instrumentation.

  Previously the mysql instrumentation could cause errors when making mysql queries using an options object rather than a SQL string. The agent now handles arguments to the query method in a more robust way.

Notes

• Fixed an inverted if in config loading.

  Previously, the config loader would log a warning on success, rather than failure. Configuration loading works as expected now.

• Fixed a bug in process.nextTick instrumentation for io.js 1.8.1.

  Previously the agent would only pass the callback argument to process.nextTick. This did not cause issues in Node.js and older version of io.js, since additional arguments were ignored. In a recent change to io.js, process.nextTick was changed to pass any additional arguments to the callback, the same way setImmediate does. This change ensures all arguments are handled as expected.

Notes

• Wrapped all our calls to JSON.parse in try/catch.

  Previously, only calls that were considered unsafe due to external data input were wrapped. We are taking a more defensive stance and wrapping them all now.

• Timers attached to global are now instrumented correctly in all version of io.js.

  As of v1.6.3 of io.js, timers are no longer lazily loaded from the timers module, and are placed directly on the global object. The agent now takes this change into account and accurately wraps the timer methods.

• Improved handling of cross-application tracing headers.

  Paths that include multibyte characters will now show up correctly in cross application maps

Notes

• Names assigned to errors via Error.name now appear in the UI.

  Previously, the name of an error in the UI appeared as Error.constructor.name or with a default of Error. Now the common pattern of Error.name is respected and takes precedence.

• Child segments of external calls will now be nested correctly.

  This change causes segments that make up external calls to nest under the call correctly. Previously, the child segments appeared as siblings to external calls.

• The request_uri attribute on errors will now only include the path without any parameters.

  This behavior now matches the other New Relic agents.

Notes

• Reduce agent CPU overhead by omitting setImmediate from traces.

  The change to setImmediate makes that function behave the same way as nextTick and other frequently-called functions that are already elided from Transaction Traces.

• Mitigate a Node.js memory leak that can occur during TLS connections.

  There is an outstanding Node.js Core memory leak involving TLS connections. Clients specifying certificates, such as the New Relic Agent, quickly reveal this leak. We now mitigate this issue by using the default client certificates where possible. A new log message will be printed when the TLS memory leak workaround can not be used, such as when using a custom certificate with an HTTPS proxy.

Notes

• Fixed a bug where external requests report times longer than the transactions that initiated them. External request segments are now always ended when an error occurs.
• Fixed a bug that produced incorrect transaction names for some routes in express2 and express3.

Notes

• Fixed a bug that interfered with listing the routes in Express apps.
• Fixed a bug that caused custom transaction names to appear as "unknown".
• Added more log detail when instrumentation fails to load.