Prometheus
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Prometheus is an open-source monitoring system started in 2012 by former Google engineers. It uses a pull-based architecture to easily scale and features a powerful multi-dimensional data model and query language. Prometheus scrapes metrics from instrumented jobs like node exporters and stores time series data which can then be queried and graphed.
![How to handle counter metric
• Do you use reset?
• Do you use moving average?
h?p://www.robustpercep1on.io/how-does-a-prometheus-counter-work/
No! use rate/irate/increase func1on!
rate(h?p_response_status_total[1m])](https://image.slidesharecdn.com/prometheus-160425115600/85/Prometheus-9-320.jpg)
![powerful query language
sum by(status) (
rate(h?p_response_status_total [1m]))
)
ALERT DiskWillFillIn4Hours
IF predict_linear(node_filesystem_free{job='node'}[1h], 4*3600) < 0
FOR 5m
LABELS {
severity="page"
}
h?p://www.robustpercep1on.io/reduce-noise-from-disk-space-alerts/](https://image.slidesharecdn.com/prometheus-160425115600/85/Prometheus-10-320.jpg)
Prometheus
- 2. History • Started in 2012 by ex-Google Site Reliability Engineers • Wri?en in Go • Inspired by Google’s Borgmon – Borgmon monitors Borg • Public announcement in January 2015 h?p://www.slideshare.net/FabianReinartz/prometheus-a-next-gen-monitoring-system-3
- 3. Features • pull architecture – easy to scall out • mul1 dimensional data model • powerful query language
- 7. h?p://www.boxever.com/the-power-of-mul1-dimensional-labels-in-prometheus Counter Java Code Example
- 11. Demo(access log) • fluent-plugin-prometheus • prometheus query • grafana graph