To attempt to provide stable and reliable services, the T2 network has several monitoring systems. These systems are set up to be able to track different parameters of the network to make sure things are performing normally.
Graphical Statistics
Jeremy McDermond (NH6Z), the operator of T2OREGON, has set up an MRTG installation that polls every T2 server on five minute intervals to graph certain parameters. Right now you can find out things like byes in and out of servers, number of connections, and connection rate on these graphs. They are available at http://monitor.nh6z.net/mrtg/cgi-bin/mrtg-rrd.cgi. Pick the server that you'd like to see statistics for, and you'll see the set of graphs for it.
The source code to the script that interfaces the javAPRSSrvr status page to MRTG is available from Jeremy's web site at https://www.xenotropic.com/ham-svn/javaprssrvr_scripts/aprsstats.pl. It is written in Perl. Anonymous read-only access is allowed to the SVN server.
Duplicate Connections
Jeremy has also set up a page that will show you duplicate connections into the T2 network. Note that this only tells you if a system is connected to two T2 servers, not if they have extraneous connections to the core servers, or to clients of the T2 servers. It is available at http://monitor.nh6z.net/dupes. The program that generates this page runs every half hour on the half hour. You can get historical data from http://monitor.nh6z.net/dupes/archive. The file name format is duplconn-YYYYMMDD-HHMM.html where YYYY is year, MM is month, DD is day, HH is hour, and MM is minutes. Right now these files are kept indefinitely, but in the future there probably will be a process that will throw old files away after a reasonable amount of time.
The source code to this script is also available from Jeremy's SVN repository at https://www.xenotropic.com/ham-svn/javaprssrvr_scripts/duplconn.pl and is also written in Perl.
Smoke Ping
John Ronan (IE7IG), the operator of T2IRELAND, has set up a copy of smokeping to measure the ping times between his server and the rest of the servers on the network. It can be accessed at http://ireland.aprs2.net/cgi-bin/smokeping.cgi
T2Notify
Joe Bennett (KA3NAM), operator of T2MCI and T2HUB4, has set up the T2Notify system that polls the various servers to make sure they're up and running. The author of this page knows little about it and would like Joe, or someone else to jump in here and write a chunk on that system.
Status Readout
Gerhard (F5VAG), operator of T2FRANCE, has written a script that is accessible from the main T2 home page that polls the various servers and shows which ones are up and down. Again, folks should feel free to fill in details here.