added mtail script to keep track of WAL-E backups to S3

As part of https://gitlab.com/gitlab-com/infrastructure/issues/1095, this mtail script would be able to track the number of successful WAL-E archivals in a counter.

added 1 commit

• cdf6fd15 - Added extra vars and timestamp to mtail script

Compare with previous version

/cc @bjk-gitlab thanks for the help with the mtail script !

mentioned in commit 9e7e72fd

merged