Monitoring Cloud Native Applications with Prometheus
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The document discusses Prometheus, an open-source monitoring and alerting toolkit aimed at operational systems monitoring in dynamic cloud environments. It highlights key features such as a powerful query language (PromQL), dimensional data model, and the use of exporters for metrics exposure. Additionally, it covers writing alerts and the role of the alert manager in dispatching alerts based on defined conditions.
![PromQL & Label based queries
http_requests_total all time series related to the metric http_requests_total
http_requests_total{code="200",method="get"} time series related to successful request with
method get for the metric http_requests_total
http_requests_total{code="200",method="get"}[5m] returns a range vector
http_requests_total{status!~"^4..$"}
Selecting all errors-related time series using
regexes
sum(rate(http_requests_total[5m])) by (job) Applying functions, in this case we sum over a
range vector and aggregating by job](https://image.slidesharecdn.com/monitoringcloud-nativeapplicationswithprometheus-170701110156/85/Monitoring-Cloud-Native-Applications-with-Prometheus-16-320.jpg)
Monitoring Cloud Native Applications with Prometheus
- 1. Cloud-Native Monitoring With Prometheus Jacopo Nardiello Founder & DevOps Engineer @jnardiello
- 2. Thanks to our sponsors
- 4. What is Prometheus? Community Driven Open-source Monitoring and Alerting toolkit, ships a time series database, an alerting entity and a number of integration tools to expose metrics.
- 5. A bit of context around Prometheus Started in 2012 as a SoundCloud internal project Second project to join CNCF after Kubernetes
- 6. Focus Operational systems monitoring Dynamic cloud environments
- 7. Natively integrates with existing providers/tools and extract scrape targets
- 9. Core features ● A powerful query language - PromQL ● Dimensional Data model ● Optimized to be efficient ● Operational & Architectural simplicity
- 10. Pull /metrics endpoints Model & typical monitoring scenario
- 11. The Architecture behind Prometheus
- 12. Let’s go a bit hands-on
- 13. Time Series Database & Web UI http://demo.robustperception.io:9090/graph
- 16. PromQL & Label based queries http_requests_total all time series related to the metric http_requests_total http_requests_total{code="200",method="get"} time series related to successful request with method get for the metric http_requests_total http_requests_total{code="200",method="get"}[5m] returns a range vector http_requests_total{status!~"^4..$"} Selecting all errors-related time series using regexes sum(rate(http_requests_total[5m])) by (job) Applying functions, in this case we sum over a range vector and aggregating by job
- 17. ACHTUNG! Labels are transparent to Prometheus whatever you define when exposing a metric, will be available to query in the db.
- 18. Pulling metrics ● How do you expose those metrics? ● Exporters ● Language specific SDKs
- 19. /metrics # HELP hash_seconds Time taken to create hashes # TYPE hash_seconds histogram hash_seconds_bucket{code="200",le="1"} 2 hash_seconds_bucket{code="200",le="2.5"} 2 hash_seconds_bucket{code="200",le="5"} 2 hash_seconds_bucket{code="200",le="10"} 2 hash_seconds_bucket{code="200",le="+Inf"} 2 hash_seconds_sum{code="200"} 9.370800000000002e-05 hash_seconds_count{code="200"} 2
- 20. Exporters The community has contributed writing exporters for pretty much everything https://prometheus.io/docs/instrumenting/exporters/
- 21. Alerting, Writing alerts: a simple example ALERT <alert_name> IF <condition> FOR 5m LABELS { severity="error" } ANNOTATIONS { summary = <summary>, description = <description>, }
- 22. Alert-Manager, Writing alerts: a real-world example ALERT NODE_DISK_FREE_SPACE_ROOT_PARTITION_80 IF ((node_filesystem_size{fstype="rootfs"}-node_filesystem_avail{fstype="rootfs"})/node_filesystem_size{fstype="rootfs"})*100 > 80 FOR 5m LABELS { severity="error" } ANNOTATIONS { summary = "Current disk usage on root partition is {{ $value }}% on node {{ $labels.instance }}", description = "Current disk usage on root partition is {{ $value }}% on node {{ $labels.instance }}", fixes = "Current disk usage on root partition is {{ $value }}% on node {{ $labels.instance }}", }
- 23. Alert Dispatching Job of the alert-manager is to dispatch alerts to the right channel according to their severity
- 24. Wrapping up