#!/bin/bash
# You can add a cron job for this little script
SUBJECT='Gitlab Disk Space Monitoring'
USED=$(df / | grep / | awk '{ print $5 }' | sed 's/%//g')
RECIPIENTS='rec1@email.com, rec2@email.com, rec3@email.com'

sendmail "$RECIPIENTS" <<EOF
subject: $SUBJECT: $USED%
to: $RECIPIENTS

Your team have used $USED% of my disk space.
EOF