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APM is a production-grade process manager for Linux, built for DevOps and backend teams. Run and supervise Node.js, Python, Go, Rust, Ruby, PHP, or any Linux executable. Ships with a built-in reverse proxy, token bucket rate limiter, TLS/mTLS, file watcher, and a live web GUI — all in a single 2.5MB static binary with zero dependencies. | Know the moment your scheduled jobs fail or run too long. Open source cron job monitoring with duration anomaly detection. |
Process management, Reverse proxy, Rate limiting, TLS/mTLS, File watcher, Live dashboard, Load balancing, Static binary, Zero dependencies, Log management, CLI monitor, Health monitoring, Auto restart, Clustering, Zero downtime deployment, CPU monitoring, Memory monitoring, Environment variables, Startup scripts | Cron job monitoring, Long-running job detection, Output assertions, Backup monitoring, ETL job monitoring |
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HAProxy (High Availability Proxy) is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications.

Grafana is a general purpose dashboard and graph composer. It's focused on providing rich ways to visualize time series metrics, mainly though graphs but supports other ways to visualize data through a pluggable panel architecture. It currently has rich support for for Graphite, InfluxDB and OpenTSDB. But supports other data sources via plugins.

Sidekiq uses threads to handle many jobs at the same time in the same process. It does not require Rails but will integrate tightly with Rails 3/4 to make background processing dead simple.

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elasticsearch.

Prometheus is a systems and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts if some condition is observed to be true.

Nagios is a host/service/network monitoring program written in C and released under the GNU General Public License.

A modern HTTP reverse proxy and load balancer that makes deploying microservices easy. Traefik integrates with your existing infrastructure components and configures itself automatically and dynamically.

Netdata collects metrics per second & presents them in low-latency dashboards. It's designed to run on all of your physical & virtual servers, cloud deployments, Kubernetes clusters & edge/IoT devices, to monitor systems, containers & apps

Beanstalks's interface is generic, but was originally designed for reducing the latency of page views in high-volume web applications by running time-consuming tasks asynchronously.

Zabbix is a mature and effortless enterprise-class open source monitoring solution for network monitoring and application monitoring of millions of metrics.