check_pgbackrest 2.1 has been released

_Mons, Belgium, September 21, 2021_

`check_pgbackrest` is designed to monitor [pgBackRest](https://pgbackrest.org) backups from Nagios, relying on the status information given by the [info](https://pgbackrest.org/command.html#command-info) command.

It allows to monitor the backups retention and the consistency of the archived WAL segments.

Changes in check_pgbackrest 2.1
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* Only support pgBackRest **2.33** and above in order to add support for the multi-repository feature.
Introduce the `--repo` option to set the repository index to operate on. When multiple repositories will be found, if the `--repo` argument is not provided, the services will operate on all repositories defined, checking for inconsistencies across multiple repositories.
It is however recommended to also define checks using the `--repo` argument to verify the sanity of each repository separately.
(Reviewed by Adrien Nayrat)
* Add a new `max-archives-check-number` option for the archives service. This is intended to use in case of timeline switch and when boundary WAL can't be detected properly, in order to prevent infinite WAL archives check.
* Add `prtg` output format (Hans-Peter Zahno).

Links & Credits
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This is an open project, licensed under the PostgreSQL license.
Any contribution to improve it is welcome.

Links:

* Download: https://github.com/pgstef/check_pgbackrest/releases
* Support: https://github.com/pgstef/check_pgbackrest/issues