Datadog is not available as a self-hosted solution but there are plenty of alternatives for power users and business that want to host a solution on-premise. The best Self-Hosted alternative is Zabbix, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Datadog and many of them are available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting Self-Hosted alternatives to Datadog are Grafana (Free, Open Source), Netdata (Free, Open Source), Sentry (Freemium) and Graylog (Free, Open Source).
Gather and analyze accurate statistics and performance metrics, visualize it, get notified about current and potential issues without delay, and take advantage of our time-tested professional development and support.
Zabbix vs Datadog opinions
Almost everyone thinks Zabbix is a great alternative to Datadog.
Zabbix does not work off of the StatsD / Graphite basis, requires an agent on each monitored instance (instead of sending simple updates via UDP, or HTTP), Zabbix cannot adapt to dynamic infrastructure environments.
Infrastructure-wide health monitoring & performance troubleshooting in one place. Collaborate in the same place as relevant data from your systems and applications, reducing mean time to acknowledge (MTTA), & mean time to resolution. (MTTR).
Graylog is an open source syslog implementation that stores your logs in Elasticsearch. It consists of a server and web interface written in Java that accepts your syslog messages via TCP or UDP (or GELF messages) and stores it in the database.
PHP Server Monitor is a script that checks whether your websites and servers are up and running. It comes with a web based user interface where you can manage your services and websites, and you can manage users for each server with a mobile number and email address.
Loki is a horizontally-scalable, highly-available, multi-tenant log aggregation system inspired by Prometheus. It is designed to be very cost effective and easy to operate. It does not index the contents of the logs, but rather a set of labels for each log stream.