Improve stability

Added

• Allow appsignal.group and appsignal.format attributes in OpenTelemetry logs to override the log line's group and format.

  When present, appsignal.group overrides the resource-level service name as the log group, and appsignal.format (one of plaintext, logfmt, json, autodetect) overrides the log source's parsing format.

Fixed

• Fix crashes when truncating attribute keys and values whose length limit fell in the middle of a multi-byte UTF-8 character. Truncation now rounds the cut point down to the nearest character boundary instead of panicking.
• Continue reporting non-disk host metrics when a mount is frozen.

This release can be installed through our collector packages and Docker image.