Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization. 
 
 It has been used to link clusters across university campuses and around the world and can scale to handle clusters with 2000 nodes. It relies on a multicast-based listen/announce protocol to monitor state within clusters. The ganglia system comprises two unique daemons, a PHP-based web front-end. 
 
 Demo:
 <UL>
	<LI><A HREF="http://monitor.millennium.berkeley.edu/" target="_blank">http://monitor.millennium.berkeley.edu/</A>. Monitoring of University of California Berkeley Grid.</LI>
	<LI><A HREF="http://ganglia.wikimedia.org/" target="_blank">http://ganglia.wikimedia.org/</A> Monitoring of Wikimedia grid</LI>
 </UL>
 Sourceforge location: <A HREF="http://sourceforge.net/projects/ganglia/" target="_blank">http://sourceforge.net/projects/ganglia/</A>

Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization.

Ganglia - scalable distributed monitoring system

Foreman is a complete lifecycle management tool for physical and virtual servers. It helps system administrators manage servers throughout their lifecycle, from provisioning and configuration to orchestration and monitoring. Using Puppet or Chef and Foreman's smart proxy architecture, you can easily automate repetitive tasks, quickly deploy applications, and proactively manage change, both on-premise with VMs and bare-metal or in the cloud.

Foreman - Complete Lifecycle Management Tool for Physical and Virtual Servers

Salt is a new approach to infrastructure management. Easy enough to get running in minutes, scalable enough to manage tens of thousands of servers, and fast enough to communicate with them in seconds. Salt delivers a dynamic communication bus for infrastructures that can be used for orchestration, remote execution, configuration management and much more.

SaltStack - Infrastructure automation and management system

etcd is a distributed, consistent key-value store for shared configuration and service discovery. It is simple, secure, fast and reliable. it uses the Raft consensus algorithm to manage a highly-available replicated log.


etcd - Distributed reliable key-value store for the most critical data of a distributed system

PM2 is a production process manager for Node.js applications with a built-in load balancer. It allows you to keep applications alive forever, to reload them without downtime and to facilitate common system admin tasks.PM2 is constantly assailed by more than 1800 tests.
<ul>
<li>Simple and efficient process management (start/stop/restart/delete/show/monit)</li>
<li>Keep your application ALWAYS ONLINE with auto restarts and init system script generation</li>
<li>Clusterize Node.js Applications without code change to increase performance and reliability</li>
<li>Hot Reload Node.js Applications without extra configuration</li>
</ul>

PM2 is a production process manager for Node.js applications with a built-in load balancer. It allows you to keep applications alive forever, to reload them without downtime and to facilitate common system admin tasks.PM2 is constantly assailed by more than 1800 tests.

pm2 - Node.js Production Process Manager with a built-in Load Balancer

An application metrics facade for the most popular monitoring tools. Instrument your code with dimensional metrics with a vendor neutral interface and decide on the monitoring backend at the last minute. Micrometer is the instrumentation library underpinning Spring Boot 2.0's metrics collection.
 
As an instrumentation facade, Micrometer allows you to instrument your code with dimensional metrics with a vendor-neutral interface and decide on the monitoring system as a last step. Instrumenting your core library code with Micrometer allows the libraries to be included in applications that ship metrics to different backends. It supports out-of-the-box instrumentation of caches, the class loader, garbage collection, processor utilization, thread pools, and more tailored to actionable insight.

 An application metrics facade for the most popular monitoring tools. Instrument your code with dimensional metrics with a vendor neutral interface and decide on the monitoring backend at the last minute. Micrometer is the instrumentation library underpinning Spring Boot 2.0's metrics collection.

Micrometer - An application metrics facade for the most popular monitoring tools

Pinpoint is an APM (Application Performance Management) tool for large-scale distributed systems written in Java. Modelled after Dapper, Pinpoint provides a solution to help analyze the overall structure of the system and how components within them are interconnected by tracing transactions across distributed applications.
 
Services nowadays often consist of many different components, communicating amongst themselves as well as making API calls to external services. How each and every transaction gets executed is often left as a blackbox. Pinpoint traces transaction flows between these components and provides a clear view to identify problem areas and potential bottlenecks.

Pinpoint is an APM (Application Performance Management) tool for large-scale distributed systems written in Java. Modelled after Dapper, Pinpoint provides a solution to help analyze the overall structure of the system and how components within them are interconnected by tracing transactions across distributed applications.

Pinpoint - Application Performance Management tool for large-scale distributed systems in Java

SkyWalking is an APM(application performance monitor) system, especially designed for microservices, cloud native and container-based (Docker, Kubernetes, Mesos) architectures. It provides distributed tracing, service mesh telemetry analysis, metric aggregation and visualization all-in-one solution. Its feature include:
<ul>
<li>Service, service instance, endpoint metrics analysis</li>
<li>Root cause analysis</li>
<li>Service topology map analysis</li>
<li>Service, service instance and endpoint dependency analysis</li>
<li>Slow services and endpoints detected</li>
<li>Performance optimization</li>
<li>Distributed tracing and context propagation</li>
<li>Database access metric. Detect slow database access statements(including SQL statements).</li>
<li>Alarm</li>
</ul>

SkyWalking is an APM(application performance monitor) system, especially designed for microservices, cloud native and container-based (Docker, Kubernetes, Mesos) architectures. It provides distributed tracing, service mesh telemetry analysis, metric aggregation and visualization all-in-one solution.

Apache Skywalking - A distributed tracing system, and APM ( Application Performance Monitoring )

Nosqlclient (Formerly Mongoclient) - Cross-platform and self hosted, easy to use, intuitive mongodb management tool. Its features include MongoDB Shell, Index management, User management, Schema analyzer, Live monitoring, File management and lot more.

Nosqlclient (Formerly Mongoclient) - Cross-platform and self hosted, easy to use, intuitive mongodb management tool

Cachet is a beautiful and powerful open source status page system. It helps to list your services components, Log incidents, JSON API, Subscriber notifications via Email, Two factor authentication and lot more.

Cachet - An open source status page system, for everyone

Pyroscope is an open source continuous profiling platform. It will help you Find performance issues in your code, Resolve issues with high CPU utilization, Understand the call tree of your application, Track changes over time. It can store years of profiling data from multiple applications. You can look at years of data at a time or zoom in on specific events. 

Pyroscope - Open Source Continuous Profiling Platform


SCOUTER is an open source APM like new relic and appdynamics. (APM means Application Performance Monitoring or Application Performance Management.) SCOUTER shows metrics about Users (Active user, Recently used user, Today visitor), Services ( Active service, TPS, Response time, Application profiles(method profile, sql profile, external call profile etc) and Resources (Cpu, Memory, Network and Heap usage, Connection pools etc).   


    

SCOUTER - APM (Application Performance Management) tool.

OpenNMS focuses on three main areas: 
	Service Polling - determining service availability and reporting on same. 
	Data Collection - collecting, storing and reporting on network information as well as generating thresholds. 
	Event and Notification Management - receiving events, both internal and external, and using those events to feed a robust notification system, including escalation 
 <UL>
	<LI>SNMP, HTTP, JMX Data collection</LI>
	<LI>Graphical Reports</LI>
	<LI>Polling / Monitoring </LI>
	<LI>Auto discovery</LI>
 </UL>

OpenNMS is the world's first enterprise grade network management platform developed under the open source model. A Java/XML-based Distributed Network & Systems Management platform.

OpenNMS

Nagios monitors your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning properly. It provides centralized view of entire monitored IT infrastructure. In the event of a failure, Nagios can alert technical staff of the problem, allowing them to begin remediation processes before outages affect business processes, end-users or customers. 

 Nagios could be extended via Plugins. It is possible to monitor any probes (temperature, alarms...), which is capable of sending data to specific plugin. It has web and mobile interface for viewing current network status, notifications, problem history, log files, etc. 
 
 <A HREF="http://nagiosplugins.org/" target="_blank">http://nagiosplugins.org/</A> lists all available plugins.

Nagios monitors your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning properly. It provides centralized view of entire monitored IT infrastructure. In the event of a failure, Nagios can alert technical staff of the problem, allowing them to begin remediation processes before outages affect business processes, end-users or customers.

Nagios - monitors your entire IT infrastructure

This is effectively the missing connector between speaking to a JVM via JMX on one end and whatever logging / monitoring / graphing package that you can dream up on the other end.
 
jmxtrans is very powerful tool which uses easily generated JSON (or YAML) based configuration files and then outputs the data in whatever format you desire. It does this with a very efficient engine design that will scale to communicating with thousands of machines from a single jmxtrans instance. The core engine is very solid and there are writers for Graphite, StatsD, Ganglia, cacti/rrdtool, OpenTSDB, text files, and stdout.

This is effectively the missing connector between speaking to a JVM via JMX on one end and whatever logging / monitoring / graphing package that you can dream up on the other end.

jmxtrans - JMX metrics exporter

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