Fluent Bit is described as 'Open source and multi-platform Log Forwarder which allows you to collect data/logs from different sources, unify and send them to multiple destinations. It's fully compatible with Docker and Kubernetes environments' and is an app. There are three alternatives to Fluent Bit for Linux, BSD, Self-Hosted, Mac and Windows. The best Fluent Bit alternative is StatsD, which is both free and Open Source. Other great apps like Fluent Bit are Telegraf and collectd.
A network daemon that runs on the Node.js platform and listens for statistics, like counters and timers, sent over UDP or TCP and sends aggregates to one or more pluggable backend services (e.g., Graphite).
StatsD is the most popular Linux alternative to Fluent Bit.
StatsD is the most popular Open Source & free alternative to Fluent Bit.
Telegraf is a metric collection daemon that can collect metrics from a wide array of inputs and write them into a wide array of outputs. It is plugin-driven for both collection and output of data so it is easily extendable.
Telegraf is the most popular Windows, Mac & Self-Hosted alternative to Fluent Bit.
collectd is a daemon which collects system performance statistics periodically and provides mechanisms to store the values in a variety of ways, for example in RRD files.
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Like collectd, telegraf is a tiny agent for monitoring a system and passing the data to a larger database (typically running on another central server). Telegraf is written is go, so is secure and easy to install. It ya support for FreeBSD, Linux, Windows, etc. making it very versatile. The InfluxDB database it writes to is the best time-series database in the business.