Ask HN: large system monitoring 18 years ago
We have lots of people who use Paglo to monitor data center infrastructures. In fact we use Paglo extensively to monitor itself. The best thing is that it is easy to feed in custom data into Paglo and trend that alongside other information about the infrastructure. For example, I watch the side of queues in our messaging system together with the load averages, memory and bandwidth usage of key servers.
We also use monit to monitor and restart processes under Linux. It is great for handling a couple of services which leak memory and need to be restarted periodically.