export metrics for prometheus

[mitch10593]

veaf_exporter{version="1.13.0"} 1
dcs_up{server="public"} 0
dcs_mission_time{server="public"} 0
dcs_players_count{server="public"} 1
dcs_paused{server="public"} 1
dcs_online_time{server="public"} 6943
dcs_mission{server="public",theatre="Caucasus"} 1
dcs_up{server="private"} 0
dcs_mission_time{server="private"} 0
dcs_players_count{server="private"} 1
dcs_paused{server="private"} 1
dcs_online_time{server="private"} 4218
dcs_mission{server="private",theatre="Caucasus"} 1
dcs_up{server="public2"} 0
dcs_mission_time{server="public2"} 0
dcs_players_count{server="public2"} 1
dcs_paused{server="public2"} 1
dcs_online_time{server="public2"} 1517
dcs_mission{server="public2",theatre="Caucasus"} 1
dcs_up{server="private2"} 0
dcs_mission_time{server="private2"} 0
dcs_players_count{server="private2"} 1
dcs_paused{server="private2"} 1
dcs_online_time{server="private2"} 6734
dcs_mission{server="private2",theatre="Syria"} 1