[root@librenms librenms]# php validate.php
====================================
Component | Version
--------- | -------
LibreNMS  | 1.56-3-g74724a4
DB Schema | 2019_09_29_114433_change_default_mempool_perc_warn_in_mempools_table (142)
PHP       | 7.2.21
MySQL     | 5.5.60-MariaDB
RRDTool   | 1.4.8
SNMP      | NET-SNMP 5.7.2
====================================

[OK]    Composer Version: 1.9.0
[OK]    Dependencies up-to-date.
[OK]    Database connection successful
[FAIL]  Database: incorrect column (notifications/datetime)
[FAIL]  Database: incorrect column (users/created_at)
[FAIL]  We have detected that your database schema may be wrong, please report the following to us on Discord (https://t.libren.ms/discord) or the community site (https://t.libren.ms/5gscd):
        [FIX]:
        Run the following SQL statements to fix.
        SQL Statements:
         ALTER TABLE `notifications` CHANGE `datetime` `datetime` timestamp NOT NULL DEFAULT '1970-01-02 00:00:00' ;
         ALTER TABLE `users` CHANGE `created_at` `created_at` timestamp NOT NULL DEFAULT '1970-01-02 00:00:01' ;
[WARN]  Your install is over 24 hours out of date, last update: Tue, 01 Oct 2019 06:51:07 +0000
        [FIX]:
        Make sure your daily.sh cron is running and run ./daily.sh by hand to see if there are any errors.
[FAIL]  We have found some files that are owned by a different user than librenms, this will stop you updating automatically and / or rrd files being updated causing graphs to fail.
        [FIX]:
        sudo chown -R librenms:librenms /opt/librenms
        sudo setfacl -d -m g::rwx /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/
        sudo chmod -R ug=rwX /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/
        Files:
         /opt/librenms/.git/index
         /opt/librenms/logs/librenms.log
         /opt/librenms/logg
         /opt/librenms/syslog.php