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What tool do you use to monitor your servers?

I'd like to get a good overview of the various monitoring tools. I'm looking for something modern, fresh and lightweight that gives me insight in the trends of CPU usage, memory usage, disk usage, network traffic, etc.. and optionally can give alerts about it.

The server already has the HP-SNMP-Agents installed, so those could be used for information retrieval.

I currently run one server, and plan to add a few more.

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marked as duplicate by Caleb, Kamil Kisiel, ewwhite, EEAA, Zypher May 3 '11 at 14:29

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

This site isn't very well suited for this kind of question. It's not a question with a right answer. It sounds like you already know some of the major options. You should read up and then ask here when you have more specific answerable questions. – Caleb May 3 '11 at 13:31

Take look at OpenNMS - is java written, opensource, primarily intended to monitor SNMP devices, but also provide set of different pollers (HTTP, JMX for example ). System is powerful enough. It builds RRD based graphs, you may set system send notifications about different service outages, also you can have different thresholds enbled to send alarms when some resource usage get critical.

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The OpenNMS graphs aren't that great, but the polling and alerting works well. I use OpenNMS in conjunction with Orca (which also uses RRD) to get a good picture of my environment. – ewwhite May 3 '11 at 14:13

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