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May 2021

Heartbeat Metric Improvements

One of Memfault's most capable features is Metrics. With Metrics, you can determine how specific metrics on a single device correlate with each other to root cause performance and power regressions, or aggregate them on a fleet level and determine whether the health of your fleet of devices is improving over time!

We're announcing new features today which should help make our metrics feature more usable.

First, users can now view all the Metric names that have been received from heartbeat events in the Settings -> Metrics page. This allows for easy auditing of metric names and configrations.

If you find any that are stale or shouldn't be tracked anymore, you can archive them.

When Edit is clicked, users can configure the valid ranges for the metric, which will improve the displayed charts by normalizing the Y-axis to possible values. An example of where this could be useful is battery life, where the min and max values are 0-100.

Users can also specify a single value for Memfault to ignore, such as 0xffffffff, which can represent the absence of a value.

These new features will enable developers and customer support representatives to more easily dig into the health of a single device and the entire fleet.

That's not all though! We've made more improvements to symbol file uploading, bugreport filtering, and the archiving of software versions.


  • Add a progress bar to OTA & Symbol File upload pages.

  • Users can now click on sections within the Software Versions chart to filter to specific devices.

  • Improved the Software and Releases pages by adding "Archive" buttons and filtering.

  • The Memfault Project Key is displayed prominently in the Settings panel and can be copied with a single button click.

  • Pagination settings are remembered between pages and reloads.


  • Added support for collecting additional register information when a Hardfault takes place when using the Zephyr port. This information will be decoded and displayed in the Memfault UI in the "Exceptions" tab.
  • Support for Dialog DA145xx chip family (Huge thanks to @iandmorris for the help here!)
  • The GNU or Memfault Build ID is now passed with each coredump captured. This should allow for more reliable symbolication and easier symbol file uploads.
  • Memfault Coredumps can now be optionally saved into the OTA slot for ESP32.
  • Fixed a bug in memfault_log_save_preformatted which could have caused a buffer overflow.
  • Fixed ESP32 backtrace when only active stack RAM is collected.
  • Hardened memfault_http_parse_response() utility to parse HTTP responses with headers that exceed a length of 128 bytes.
  • For more details on the changes to the Firmware SDK that didn't make the changelog, check out the Memfault Firmware SDK changelog.


  • Enabled filtering bugreports by the Request ID that was passed in on capture.

  • For more details on the changes to the Android Bort SDK that didn't make the changelog, check out the Memfault Bort SDK changelog.