memfaultd 1.16.0

This release includes two major new features:

• A new coredump capture mode to process the coredumps directly on device
  resulting in even smaller crash signature and guaranteeing that no user data
  is uploaded;
• High Resolution Telemetry for Linux, storing every single datapoint and
  enabling second-by-second data from Linux devices, for even deeper debugging
  capability.

Added

• Built-in wireless metric capture - wireless interfaces being monitored by the
  metrics.system_metric_collection.network_interfaces configuration will now
  have RSSI captured alongside the existing network metrics
• Added a boottime_duration_ms to Metric Reports that indicates the duration
  of the report independent of whether the CPU was running or not. This is
  intended to be used for debugging purposes for teams whose devices sleep often
  while in use.
• The new on-device stack unwinding option for capturing crash Traces, which can
  be enabled by setting coredump.capture_strategy.type to stacktrace in
  memfaultd.conf.
• High resolution telemetry, which is enabled by default and can be disabled or
  have its rate limiting configured with the metrics.high_resolution_telemetry
  field.
• Support for Yocto Scarthgap in meta-memfault. This support will be extended
  to meta-memfault-example in an upcoming release. Check out the scarthgap
  branch if you are using that version of Yocto!
• The built-in system memory metrics now include additional states such as
  Cached and Buffered.
• The metrics.statsd_server has had a new option, legacy_gauge_aggregation,
  added that averages Gauge metric readings rather than simply storing the
  most recent value. This is meant to allow for a smooth migration from
  collectd's StatsD server to memfaultd's. New integrations should
  use the h (Histogram) metric type for metrics whose readings should
  be aggregated via average.

Changed

• The default on-device rate limit for logs ingested by memfaultd has been
  increased from 500 lines per minute to 1000 lines per minute

Fixed

• Arbitrary ASCII strings between 1 and 128 in length can
  now be used in StatsD metric keys (besides the : delimiter),
  matching the behavior described in the docs.

Removed

Some built-in metrics were removed, as the naming conventions were not
consistent. All of these metrics were added in 1.15.0. The list can
be found below:

• cpu_usage_pct
• connectivity_recv_bytes
• connectivity_sent_bytes
• connectivity_<interface>_recv_bytes
• connectivity_<interface>_sent_bytes
• memory_used_pct
• memory_<process>_pct
• cpu_usage_<process>_pct
• storage_used_<disk>_pct