I have a service (written by myself) running on a Debian (Jessie) server, and the service's own logs happen to indicate that it restarted at a particular time. There is no indication of a segfault or other crash, so I am now trying to figure out if the application somehow silently failed and got respawned by systemd, or whether a user purposely restarted the service via systemctl.The shell history doesn't show such activity, but that is not conclusive because of export HISTCONTROL=ignoreboth and because an SSH session might have just timed out, preventing a previous login's bash history from being written to disk. The server was not rebooted at the time.But I would expect that systemd itself should keep a log indicating when a service was purposely restarted.  To my surprise I was unable to find any documentation (e.g. for journalctl) on how to get such logs.Some other posts (e.g. Where is / why is there no log for normal user systemd services?) seem to indicate that there should be log messages like this:Jan 15 19:28:08 qbd-x230-suse.site systemd[1]: Starting chatty.service...Jan 15 19:28:08 qbd-x230-suse.site systemd[1]: Started chatty.service.But I don't see such log messages on my system.Is there a way to find out when systemd services were started, stopped or restarted?Edit: It seems the typical problem people might run into is that they run journalctl as a non-privileged user. This is not the case for me, I have been operating as root the whole time. In response to a comment, running grep systemd /var/log/syslog gives me only this:Jun  6 09:28:35 server systemd[22057]: Starting Paths.Jun  6 09:28:35 server systemd[22057]: Reached target Paths.Jun  6 09:28:35 server systemd[22057]: Starting Timers.Jun  6 09:28:35 server systemd[22057]: Reached target Timers.Jun  6 09:28:35 server systemd[22057]: Starting Sockets.Jun  6 09:28:35 server systemd[22057]: Reached target Sockets.Jun  6 09:28:35 server systemd[22057]: Starting Basic System.Jun  6 09:28:35 server systemd[22057]: Reached target Basic System.Jun  6 09:28:35 server systemd[22057]: Starting Default.Jun  6 09:28:35 server systemd[22057]: Reached target Default.Jun  6 09:28:35 server systemd[22057]: Startup finished in 59ms.Jun  6 09:37:08 server systemd[1]: Reexecuting.
How do I see when a systemd service was started/stopped/restarted?
systemd;journald