This is logged for every Puppet run:
Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12415]: /mnt/nfs/labstore-secondary-tools-home is mounted. Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12419]: /mnt/nfs/labstore-secondary-tools-home seems healthy. Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12434]: /mnt/nfs/labstore-secondary-tools-project is mounted. Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12438]: /mnt/nfs/labstore-secondary-tools-project seems healthy. Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12453]: /mnt/nfs/labstore1003-scratch is mounted. Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12457]: /mnt/nfs/labstore1003-scratch seems healthy. Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12472]: /mnt/nfs/dumps-labstore1006.wikimedia.org is mounted. Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12476]: /mnt/nfs/dumps-labstore1006.wikimedia.org seems healthy. Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12491]: /mnt/nfs/dumps-labstore1007.wikimedia.org is mounted. Dec 12 20:45:23 tools-grid-master nfs-mount-manager[12495]: /mnt/nfs/dumps-labstore1007.wikimedia.org seems healthy.
If we trust this code, it should only output errors in normal mode.