Cleanup the JSON files in the tarball

Prior to this commit, the JSON files were being backed up but only
cleaned up every 90. This resulted in the same files being duplicated in
each tarball for 90 days. This commit cleans up the json files to ensure
that the tarballs only have a single days worth of data.

Author: Jarret Lavallee

files/metrics_tidy

@@ -55,3 +55,6 @@ find "$metrics_directory" -type f -ctime +"$retention_days" -delete
 # The return code of a pipeline is the rightmost command, which means we trigger our trap if tar fails
 find "$metrics_directory" -type f -name "*json" | \
   tar --create --gzip --file "${metrics_directory}/${metrics_type}-$(date +%Y.%m.%d.%H.%M.%S).tar.gz" --files-from -
+
+# Cleanup the backed up json files so that we do not duplicate files in the tarballs.
+find "$metrics_directory" -type f -name "*json" -delete