Debian 9 is used.
Advanced Monitoring extension is not active after the boot:
PLESK_WARN: New data will not be collected because the collecting service is stopped
The corresponding service is disabled:
# systemctl status sw-collectd
● sw-collectd.service - Startup script for statistics collecting from Plesk Panel Health Monitor
Loaded: loaded (/lib/systemd/system/sw-collectd.service; disabled; vendor preset: enabled)
Active: inactive (dead)
Plesk bug #PPPM-11069 which will be resolved in future product updates.
Until the fix became available, apply the following steps manually to resolve the issue:
Connect to the server via SSH.
Execute the following command, so the service will be started on boot automatically:
# systemctl enable sw-collectd