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Zabbix is an enterprise-class open source distributed monitoring solution. It is highly scaleable, capable of monitoring more than 100,000 devices and servers. A Zabbix agent can also be installed on UNIX and Windows hosts to monitor statistics such as CPU load, network utilization, disk space, etc. It also supports agentless monitoring via SNMP, TCP and ICMP.
The idea is to get a group of monitoring stations from around the world, and for each of them to run a tool which will report various statistics on how long it took to download a URL. These statistics will be available for download so that participatin
collectd is a daemon which collects system performance statistics periodically and provides mechanisms to store the values in a RRD files. It comes with more than 90 Plug-ins, which helps to process, store and present the data in the way we want.
Riemann monitors distributed systems. It aggregates events from your servers and applications with a powerful stream processing language. Send an email for every exception raised by your code. Track the latency distribution of your web app. See the top processes on any host, by memory and CPU. Combine statistics from every Riak node in your cluster and forward to Graphite.
Bigdesk helps to generate live charts and statistics for Elasticsearch cluster. It very easy to see how your Elasticsearch cluster is doing. It pulls data from Elasticsearch REST API and turns it into charts.
libpcap is a system-independent interface for user-level packet capture. libpcap provides a portable framework for low-level network monitoring. Applications include network statistics collection, security monitoring, network debugging, etc.
PGObserver is a battle-tested monitoring solution for your PostgreSQL databases. It covers almost all the metrics provided by the database engine's internal statistics collector, and works out of the box with all PostgreSQL versions (beginning with 9.0) as well as AWS RDS. You don’t have to install any non-standard, server-side database extensions to take advantage of its core functionality, nor do you need to register any privileged users.For some metrics you must install data-gathering wrapper functions — also known as stored procedures — on the server being monitored. This will enable you to circumvent the superuser requirements.