Output debug messages on event record
Output debug messages on event record

These are simpler than checking dbus-monitor for calls to the event
recorder, and will output even if the library can't get a connection to
DBus. They are no-ops unless you run your program with

G_MESSAGES_DEBUG=EosMetrics ./myprogram

In addition, if you compile with CFLAGS=-DDEBUG, then the messages will
be more informative and show the contents of the auxiliary payloads
passed to the library (and event keys, if applicable.)

[endlessm/eos-sdk#1867]

endlessm/eos-metrics,endlessm/eos-metrics,endlessm/eos-metrics,endlessm/eos-metrics,endlessm/eos-metrics,endlessm/eos-metrics