diff -r 1eada2e65e7a -r a0015fe2009a scripts/mysql-slave
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/mysql-slave	Thu Apr 15 15:27:45 2021 +0200
@@ -0,0 +1,3 @@
+#!/bin/sh -e
+echo -n - mysql.slave_lagging
+mysql -ureader -Bse "show slave status\\G" | grep Seconds_Behind_Master | cut -d: -f 2