Finally we do, by default, set sample_limit to 200 - so each application can export up to 200 time series without any action. Has 90% of ice around Antarctica disappeared in less than a decade? You set up a Kubernetes cluster, installed Prometheus on it ,and ran some queries to check the clusters health. To learn more, see our tips on writing great answers. or something like that. Please open a new issue for related bugs. want to sum over the rate of all instances, so we get fewer output time series, I've created an expression that is intended to display percent-success for a given metric. Once the last chunk for this time series is written into a block and removed from the memSeries instance we have no chunks left. metric name, as measured over the last 5 minutes: Assuming that the http_requests_total time series all have the labels job This is one argument for not overusing labels, but often it cannot be avoided. A time series is an instance of that metric, with a unique combination of all the dimensions (labels), plus a series of timestamp & value pairs - hence the name time series. I'm displaying Prometheus query on a Grafana table. The process of sending HTTP requests from Prometheus to our application is called scraping. Having a working monitoring setup is a critical part of the work we do for our clients. In both nodes, edit the /etc/sysctl.d/k8s.conf file to add the following two lines: Then reload the IPTables config using the sudo sysctl --system command. But the key to tackling high cardinality was better understanding how Prometheus works and what kind of usage patterns will be problematic. Is a PhD visitor considered as a visiting scholar? Prometheus metrics can have extra dimensions in form of labels. Here at Labyrinth Labs, we put great emphasis on monitoring. This patchset consists of two main elements. There will be traps and room for mistakes at all stages of this process. Prometheus allows us to measure health & performance over time and, if theres anything wrong with any service, let our team know before it becomes a problem. Once Prometheus has a list of samples collected from our application it will save it into TSDB - Time Series DataBase - the database in which Prometheus keeps all the time series. Querying examples | Prometheus All rights reserved. If you need to obtain raw samples, then a range query must be sent to /api/v1/query. If our metric had more labels and all of them were set based on the request payload (HTTP method name, IPs, headers, etc) we could easily end up with millions of time series. In both nodes, edit the /etc/hosts file to add the private IP of the nodes. So perhaps the behavior I'm running into applies to any metric with a label, whereas a metric without any labels would behave as @brian-brazil indicated? The more any application does for you, the more useful it is, the more resources it might need. our free app that makes your Internet faster and safer. In AWS, create two t2.medium instances running CentOS. Have a question about this project? following for every instance: we could get the top 3 CPU users grouped by application (app) and process
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