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Fluentd vs Prometheus: What are the differences?
What is Fluentd? Unified logging layer. Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. Fluentd helps you unify your logging infrastructure.
What is Prometheus? An open-source service monitoring system and time series database, developed by SoundCloud. 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.
Fluentd can be classified as a tool in the "Log Management" category, while Prometheus is grouped under "Monitoring Tools".
Some of the features offered by Fluentd are:
- Open source
- Flexible
- Minimum resources
On the other hand, Prometheus provides the following key features:
- a multi-dimensional data model (timeseries defined by metric name and set of key/value dimensions)
- a flexible query language to leverage this dimensionality
- no dependency on distributed storage
Fluentd and Prometheus are both open source tools. Prometheus with 25K GitHub stars and 3.55K forks on GitHub appears to be more popular than Fluentd with 8.04K GitHub stars and 938 GitHub forks.
Uber Technologies, Slack, and DigitalOcean are some of the popular companies that use Prometheus, whereas Fluentd is used by 9GAG, Repro, and Geocodio. Prometheus has a broader approval, being mentioned in 243 company stacks & 85 developers stacks; compared to Fluentd, which is listed in 64 company stacks and 18 developer stacks.
The objective of this work was to develop a system to monitor the materials of a production line using IoT technology. Currently, the process of monitoring and replacing parts depends on manual services. For this, load cells, microcontroller, Broker MQTT, Telegraf, InfluxDB, and Grafana were used. It was implemented in a workflow that had the function of collecting sensor data, storing it in a database, and visualizing it in the form of weight and quantity. With these developed solutions, he hopes to contribute to the logistics area, in the replacement and control of materials.
Pros of Fluentd
- Lightweight6
- Great for Kubernetes node container log forwarding6
- Open-source6
- Easy4
Pros of Prometheus
- Powerful easy to use monitoring40
- Flexible query language38
- Dimensional data model31
- Alerts22
- Active and responsive community21
- Easy to setup18
- Extensive integrations18
- Beautiful Model and Query language11
- Easy to extend7
- Nice6
- Written in Go3
- Good for experimentation1
- Easy for monitoring1
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Cons of Fluentd
Cons of Prometheus
- Just for metrics8
- Needs monitoring to access metrics endpoints5
- Bad UI4
- Supports only active agents2
- Written in Go2
- Not easy to configure and use2
- Requires multiple applications and tools1
- TLS is quite difficult to understand1