This is how the log behaves after activating and terminating follectd
follectd ON
Mar 28 08:03:42 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:03:44 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:03:46 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:03:48 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:03:48 Turris_JB collectd[13293]: plugin_load: plugin "cpu" successfully loaded.
Mar 28 08:03:48 Turris_JB collectd[13293]: plugin_load: plugin "df" successfully loaded.
Mar 28 08:03:48 Turris_JB collectd[13293]: plugin_load: plugin "exec" successfully loaded.
Mar 28 08:03:48 Turris_JB collectd[13293]: plugin_load: plugin "interface" successfully loaded.
Mar 28 08:03:48 Turris_JB collectd[13293]: plugin_load: plugin "memory" successfully loaded.
Mar 28 08:03:48 Turris_JB collectd[13293]: plugin_load: plugin "network" successfully loaded.
Mar 28 08:03:48 Turris_JB collectd[13293]: plugin_load: plugin "unixsock" successfully loaded.
Mar 28 08:03:48 Turris_JB collectd[13293]: Initialization complete, entering read-loop.
Mar 28 08:03:49 Turris_JB collectd[13293]: plugin_dispatch_values: No write callback has been registered. Please load at least one output plugin, if you want the collected data to be stored.
Mar 28 08:03:49 Turris_JB collectd[13293]: Filter subsystem: Built-in target `write': Dispatching value to all write plugins failed with status 2 (ENOENT). Most likely this means you didn't load any write plugins.
Mar 28 08:03:49 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:03:49 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:03:49 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:03:49 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:03:49 Turris_JB collectd[13293]: Available write targets:: [none]
=================
follectd OFF
Mar 28 08:04:19 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:04:19 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:04:19 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:04:19 Turris_JB collectd[13293]: exec plugin: exec_read_one: error = exec plugin: Failed to execute ``/usr/libexec/follectd/neighbours.sh'': Exec format error
Mar 28 08:04:19 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:04:19 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:04:19 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:04:19 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:04:19 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:04:19 Turris_JB collectd[13293]: Available write targets:: [none]
Mar 28 08:04:19 Turris_JB collectd[13293]: exec plugin: Program `/usr/libexec/follectd/neighbours.sh' has closed STDERR.
Mar 28 08:04:20 Turris_JB collectd[13293]: Exiting normally.
Mar 28 08:04:20 Turris_JB collectd[13293]: collectd: Stopping 1 read threads.
Mar 28 08:04:20 Turris_JB collectd[13293]: collectd: Stopping 1 write threads.
Mar 28 08:04:22 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:04:24 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:04:26 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:04:28 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:04:30 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:04:32 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:04:34 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'
Mar 28 08:04:36 Turris_JB foris-controller[7422]: WARNING:foris_controller_backends.collectd:Socket error occured '[Errno 2] No such file or directory'