Mattermost does not start after update to 9.2.0
After updating omnibus gitlab mattermost does not start anymore.
root@gitlab:~# dpkg-query -W gitlab-ce
gitlab-ce 9.2.0-ce.0
root@gitlab:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial
root@gitlab:~# tail -f /var/log/gitlab/mattermost/current
2017-05-22_17:41:06.20512 [2017/05/22 19:41:06 CEST] [EROR] SMTP server settings do not appear to be configured properly err=Failed to open connection details=dial tcp :0: getsockopt: connection refused
2017-05-22_17:41:06.20515 [2017/05/22 19:41:06 CEST] [INFO] Current version is 3.9.0 (3.9.0/Mon May 15 20:26:32 UTC 2017/ae3a62ef95e22ff67236e8addb1e4ca005307443/none)
2017-05-22_17:41:06.20516 [2017/05/22 19:41:06 CEST] [INFO] Enterprise Enabled: false
2017-05-22_17:41:06.20517 [2017/05/22 19:41:06 CEST] [INFO] Current working directory is /opt/gitlab/embedded/service/mattermost
2017-05-22_17:41:06.20518 [2017/05/22 19:41:06 CEST] [INFO] Loaded config file from /var/opt/gitlab/mattermost/config.json
2017-05-22_17:41:06.20518 [2017/05/22 19:41:06 CEST] [INFO] Server is initializing...
2017-05-22_17:41:06.20519 [2017/05/22 19:41:06 CEST] [INFO] Pinging SQL master database
2017-05-22_17:41:06.20743 [2017/05/22 19:41:06 CEST] [INFO] Pinging SQL replica-0 database
2017-05-22_17:41:06.20929 [2017/05/22 19:41:06 CEST] [INFO] Pinging SQL search-replica-0 database
2017-05-22_17:41:06.20932 [2017/05/22 19:41:06 CEST] [CRIT] Failed to ping DB err:missing "=" after "[]" in connection info string"
2017-05-22_17:41:07.39605 [2017/05/22 19:41:07 CEST] [INFO] Loaded system translations for 'en' from '/opt/gitlab/embedded/service/mattermost/i18n/en.json'
2017-05-22_17:41:07.39612 [2017/05/22 19:41:07 CEST] [EROR] SMTP server settings do not appear to be configured properly err=Failed to open connection details=dial tcp :0: getsockopt: connection refused
2017-05-22_17:41:07.39623 [2017/05/22 19:41:07 CEST] [INFO] Current version is 3.9.0 (3.9.0/Mon May 15 20:26:32 UTC 2017/ae3a62ef95e22ff67236e8addb1e4ca005307443/none)
2017-05-22_17:41:07.39625 [2017/05/22 19:41:07 CEST] [INFO] Enterprise Enabled: false
2017-05-22_17:41:07.39628 [2017/05/22 19:41:07 CEST] [INFO] Current working directory is /opt/gitlab/embedded/service/mattermost
2017-05-22_17:41:07.39635 [2017/05/22 19:41:07 CEST] [INFO] Loaded config file from /var/opt/gitlab/mattermost/config.json
2017-05-22_17:41:07.39636 [2017/05/22 19:41:07 CEST] [INFO] Server is initializing...
2017-05-22_17:41:07.39637 [2017/05/22 19:41:07 CEST] [INFO] Pinging SQL master database
2017-05-22_17:41:07.39873 [2017/05/22 19:41:07 CEST] [INFO] Pinging SQL replica-0 database
2017-05-22_17:41:07.40053 [2017/05/22 19:41:07 CEST] [INFO] Pinging SQL search-replica-0 database
2017-05-22_17:41:07.40056 [2017/05/22 19:41:07 CEST] [CRIT] Failed to ping DB err:missing "=" after "[]" in connection info string"
^C