StatsD vs Alerta: What are the differences?

Developers describe StatsD as "Simple daemon for easy stats aggregation". StatsD is a front-end proxy for the Graphite/Carbon metrics server, originally written by Etsy's Erik Kastner. StatsD is a network daemon that runs on the Node.js platform and listens for statistics, like counters and timers, sent over UDP and sends aggregates to one or more pluggable backend services (e.g., Graphite). On the other hand, Alerta is detailed as "A tool used to consolidate and duplicate alerts from multiple sources for quick 'at-a-glance' visualisation". It combines a JSON API server for receiving, processing and rendering alerts with a simple, yet effective Alerta Web UI and command-line tool.

StatsD and Alerta belong to "Monitoring Tools" category of the tech stack.

Some of the features offered by StatsD are:

• buckets: Each stat is in its own "bucket". They are not predefined anywhere. Buckets can be named anything that will translate to Graphite (periods make folders, etc)
• values: Each stat will have a value. How it is interpreted depends on modifiers. In general values should be integer.
• flush: After the flush interval timeout (defined by config.flushInterval, default 10 seconds), stats are aggregated and sent to an upstream backend service.

On the other hand, Alerta provides the following key features:

• Supports SQL
• Flexible alert format
• De-duplication and simple correlation

StatsD is an open source tool with 14.3K GitHub stars and 1.84K GitHub forks. Here's a link to StatsD's open source repository on GitHub.