Odd server log comment: RTPONG++

I've noticed recently and I have no idea where it is coming from. There doesn't seem to be a pattern that I could tell.

It doesn't happen after any particular command. Just every 60 seconds exact.

RTPONG++


rTriggers 1.5.2
Help 0.2.4.1
iConomy 4.65
MonsterHunt 1.0.2
BigBrother 1.8-SNAPSHOT
Cleaner 1.7
Unknown Command 1.3
TimeAnnounce 1.1
RemoteToolkitPlugin 0.31b
Commands Logging 0.1
iChat 2.2.2
LWC 2.31
Jail 0.6.1
xWarp 2.9.2
WolfPound 0.11
RemoteToolkitPlugin 0.4b
OddItem 0.6.5
milkAdmin 2.6-03.30
WolfSpawn 0.4
MidiBanks 1.3
MobBounty 2.01
Landmarks 0.1
TelePlusPlus 1.3.3
PvP Control 1.5
Towny 0.61
dynmap 0.15
Permissions 2.7
BlastControl 1.0.4
PumpkinDiver 0.16
IOBookcase 1.32
Lampstone 0.6
SignColours 0.3
DropChest 0.7.1
Factions 1.1.4
Growbie 2.3
MobileAdmin 2.4.1
iConomyChestShop 2.52
Turnstile 1.5
Tombstone 1.2.6
Stats 0.985
CommandBook 1.4.1-customized
MultiInv 1.5.2
MultiVerse 1.6.3
LastSeen 1.1
Achievements 0.981

 

It's from the heartbeat component of the Remote Toolkit.
It's presence in the log is a side effect of the fact that bukkit logs everything on the standard output/error streams.

I am currently exploring other methods of responding to heartbeat pings. If it is too much of a bother, set server-heartbeat-threshold in wrapper.properties to 0.
Keep in mind that this will disable crash detection.