Fix Alpine Linux disk usage metrics

Changed

• Fix disk usage returning a Vec with no entries on Alpine Linux when the df --local command fails.

Deprecated

• Deprecate the Appsignal.set_host_gauge and Appsignal.set_process_gauge helper methods in the Ruby gem. These methods would already log deprecation warnings in the appsignal.log file, but now also as a Ruby warning. These methods will be removed in the next major version. These methods already did not report any metrics, and still do not.

Removed

• Remove the appsignal_set_host_gauge and appsignal_set_process_gauge extension functions. These functions were already deprecated and did not report any metrics.

Fixed

• Fix the Makefile log path inclusion in the diagnose report. The diagnose tool didn't look in the correct gem extension directory for this log file.
• Fix reporting of the Ruby syntax version and JRuby version in install report better.

See the Ruby gem 3.5.4 changelog for more information.