Collect dbus (itself) stats

[cooperlees]

Add what makes sense as optional output for monitord

• Config enabled
  • When in daemon mode - Maybe also grab these stats less if the rerun period is < a dbus stat specific
    • The debug stats are non blocks / clostly to grab from dbus-broker for example

sudo dbus-send --system --dest=org.freedesktop.DBus --type=method_call --print-reply /org/freedesktop/DBus org.freedesktop.DBus.Debug.Stats.GetStats

ZBus has a module for this: https://docs.rs/zbus/latest/zbus/fdo/index.html

• Could enhance it's auto parsing to be friendlier
  DBus Spec: https://dbus.freedesktop.org/doc/dbus-specification.html#message-bus-debug-stats-interface

Daemon Specific

dbus-broker

• Would also love parsing these and making stats - especially quota usage
• Again, config enabled please

[cooperlees]

Started work on this, but seems zbus doesn't like what dbus-broker returns:

• https://github.com/cooperlees/monitord/tree/dbus_stats

[cooperlees]

z-galaxy/zbus#1338 - Fix that will allow monitord to use fdo::get_stats from zbus

[cooperlees]

The plot thickens, dbus-broker does not return the standard metrics: bus1/dbus-broker#390

• So asking for that too :)

[cooperlees]

Ok, so we have base statistics here starting from 0.16.0 - It's off by default in the example config, but on by default I realize in Default impl for the config struct ... DO we want that?

Left to do:

• Some unittests - I'm having a hard time mocking zvariant structs - fefc9fe
  • Will take any help there
• Turn on by default?
• Implement UserUsage
• Implement linux_security_label parsing
• Paralleize dbus_proxy.get_name_owner(name.clone()).await?;

[cooperlees]

0.17.0 groups them better via cgroup and user ... But still need untitests etc.