The keep and drop actions allow us to filter out targets and metrics based on whether our label values match the provided regex. This role uses the private IPv4 address by default. This is generally useful for blackbox monitoring of a service. See the Debug Mode section in Troubleshoot collection of Prometheus metrics for more details. The ama-metrics-prometheus-config-node configmap, similar to the regular configmap, can be created to have static scrape configs on each node. Use the following to filter IN metrics collected for the default targets using regex based filtering. Labels starting with __ will be removed from the label set after target The result can then be matched against using a regex, and an action operation can be performed if a match occurs. - Key: Name, Value: pdn-server-1 - Key: PrometheusScrape, Value: Enabled instances. their API. Prometheus For users with thousands of tasks it Much of the content here also applies to Grafana Agent users. If it finds the instance_ip label, it renames this label to host_ip. With this, the node_memory_Active_bytes metric which contains only instance and job labels by default, gets an additional nodename label that you can use in the description field of Grafana. For users with thousands of Additional labels prefixed with __meta_ may be available during the Relabeling is a powerful tool that allows you to classify and filter Prometheus targets and metrics by rewriting their label set. In many cases, heres where internal labels come into play. This can be May 29, 2017. What sort of strategies would a medieval military use against a fantasy giant? The job and instance label values can be changed based on the source label, just like any other label. Asking for help, clarification, or responding to other answers. Monitoring Docker container metrics using cAdvisor, Use file-based service discovery to discover scrape targets, Understanding and using the multi-target exporter pattern, Monitoring Linux host metrics with the Node Exporter, the Prometheus digitalocean-sd tsdb lets you configure the runtime-reloadable configuration settings of the TSDB. Prometheus is configured through a single YAML file called prometheus.yml. windows_exporter: enabled: true metric_relabel_configs: - source_labels: [__name__] regex: windows_system_system_up_time action: keep . In our config, we only apply a node-exporter scrape config to instances which are tagged PrometheusScrape=Enabled, then we use the Name tag, and assign its value to the instance tag, and the similarly we assign the Environment tag value to the environment promtheus label value. first NICs IP address by default, but that can be changed with relabeling. First, it should be metric_relabel_configs rather than relabel_configs. Developing and deploying an application to Verrazzano consists of: Packaging the application as a Docker image. Its value is set to the The reason is that relabeling can be applied in different parts of a metrics lifecycle from selecting which of the available targets wed like to scrape, to sieving what wed like to store in Prometheus time series database and what to send over to some remote storage. .). In advanced configurations, this may change. Prometheus is configured via command-line flags and a configuration file. Heres a small list of common use cases for relabeling, and where the appropriate place is for adding relabeling steps. This relabeling occurs after target selection. An additional scrape config uses regex evaluation to find matching services en masse, and targets a set of services based on label, annotation, namespace, or name. This is a quick demonstration on how to use prometheus relabel configs, when you have scenarios for when example, you want to use a part of your hostname and assign it to a prometheus label. Prometheusrelabel_config sell prometheus relabel_configs metric_relabel_configs example_metric {=""} prometheus.yaml It would also be less than friendly to expect any of my users -- especially those completely new to Grafana / PromQL -- to write a complex and inscrutable query every time. It changed with relabeling, as demonstrated in the Prometheus scaleway-sd For instance, if you created a secret named kube-prometheus-prometheus-alert-relabel-config and it contains a file named additional-alert-relabel-configs.yaml, use the parameters below: So if there are some expensive metrics you want to drop, or labels coming from the scrape itself (e.g. Prometheus fetches an access token from the specified endpoint with The write_relabel_configs section defines a keep action for all metrics matching the apiserver_request_total|kubelet_node_config_error|kubelet_runtime_operations_errors_total regex, dropping all others. Counter: A counter metric always increases; Gauge: A gauge metric can increase or decrease; Histogram: A histogram metric can increase or descrease; Source . The cn role discovers one target for per compute node (also known as "server" or "global zone") making up the Triton infrastructure. To drop a specific label, select it using source_labels and use a replacement value of "". Published by Brian Brazil in Posts Tags: prometheus, relabelling, service discovery Share on Blog | Training | Book | Privacy way to filter containers. There are seven available actions to choose from, so lets take a closer look. This SD discovers "monitoring assignments" based on Kuma Dataplane Proxies, configuration file, the Prometheus linode-sd sending a HTTP POST request to the /-/reload endpoint (when the --web.enable-lifecycle flag is enabled). Eureka REST API. Prometheus also provides some internal labels for us. Thanks for contributing an answer to Stack Overflow! I've been trying in vai for a month to find a coherent explanation of group_left, and expressions aren't labels. would result in capturing whats before and after the @ symbol, swapping them around, and separating them with a slash. prefix is guaranteed to never be used by Prometheus itself. input to a subsequent relabeling step), use the __tmp label name prefix. service port. Weve come a long way, but were finally getting somewhere. The global configuration specifies parameters that are valid in all other configuration For a cluster with a large number of nodes and pods and a large volume of metrics to scrape, some of the applicable custom scrape targets can be off-loaded from the single ama-metrics replicaset pod to the ama-metrics daemonset pod. When custom scrape configuration fails to apply due to validation errors, default scrape configuration will continue to be used. The address will be set to the host specified in the ingress spec. will periodically check the REST endpoint and This article provides instructions on customizing metrics scraping for a Kubernetes cluster with the metrics addon in Azure Monitor. Prometheus supports relabeling, which allows performing the following tasks: Adding new label Updating existing label Rewriting existing label Updating metric name Removing unneeded labels. The instance role discovers one target per network interface of Nova Currently supported are the following sections: Any other unsupported sections need to be removed from the config before applying as a configmap. For OVHcloud's public cloud instances you can use the openstacksdconfig. See below for the configuration options for Uyuni discovery: See the Prometheus uyuni-sd configuration file If you drop a label in a metric_relabel_configs section, it wont be ingested by Prometheus and consequently wont be shipped to remote storage. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. This minimal relabeling snippet searches across the set of scraped labels for the instance_ip label. This is often useful when fetching sets of targets using a service discovery mechanism like kubernetes_sd_configs, or Kubernetes service discovery. Prometheus relabel_configs 4. Only alphanumeric characters are allowed. Using the write_relabel_config entry shown below, you can target the metric name using the __name__ label in combination with the instance name. additional container ports of the pod, not bound to an endpoint port, are discovered as targets as well. the given client access and secret keys. integrations with this determines the relabeling action to take: Care must be taken with labeldrop and labelkeep to ensure that metrics are If a service has no published ports, a target per defined by the scheme described below. Prometheus Authors 2014-2023 | Documentation Distributed under CC-BY-4.0. Denylisting: This involves dropping a set of high-cardinality unimportant metrics that you explicitly define, and keeping everything else. The address will be set to the Kubernetes DNS name of the service and respective Alertmanagers may be statically configured via the static_configs parameter or If you want to turn on the scraping of the default targets that aren't enabled by default, edit the configmap ama-metrics-settings-configmap configmap to update the targets listed under default-scrape-settings-enabled to true, and apply the configmap to your cluster. This is most commonly used for sharding multiple targets across a fleet of Prometheus instances. record queries, but not the advanced DNS-SD approach specified in The endpoint is queried periodically at the specified refresh interval. Prometheus keeps all other metrics. After saving the config file switch to the terminal with your Prometheus docker container and stop it by pressing ctrl+C and start it again to reload the configuration by using the existing command. For example, if a Pod backing the Nginx service has two ports, we only scrape the port named web and drop the other. A static config has a list of static targets and any extra labels to add to them. Prom Labss Relabeler tool may be helpful when debugging relabel configs. the cluster state. See below for the configuration options for EC2 discovery: The relabeling phase is the preferred and more powerful PuppetDB resources. See below for the configuration options for Triton discovery: Eureka SD configurations allow retrieving scrape targets using the A consists of seven fields. See below for the configuration options for PuppetDB discovery: See this example Prometheus configuration file This will also reload any configured rule files. PrometheusGrafana. discovery endpoints. We must make sure that all metrics are still uniquely labeled after applying labelkeep and labeldrop rules. Otherwise each node will try to scrape all targets and will make many calls to the Kubernetes API server. following meta labels are available on all targets during Let's say you don't want to receive data for the metric node_memory_active_bytes from an instance running at localhost:9100. If a job is using kubernetes_sd_configs to discover targets, each role has associated __meta_* labels for metrics. This Once Prometheus scrapes a target, metric_relabel_configs allows you to define keep, drop and replace actions to perform on scraped samples: This sample piece of configuration instructs Prometheus to first fetch a list of endpoints to scrape using Kubernetes service discovery (kubernetes_sd_configs). through the __alerts_path__ label. Scrape kube-state-metrics in the k8s cluster (installed as a part of the addon) without any extra scrape config. To view all available command-line flags, run ./prometheus -h. Prometheus can reload its configuration at runtime. relabel_configs: - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scrape] action: keep regex: true // keep targets with label __meta_kubernetes_service_annotation_prometheus_io_scrape equals 'true', // which means the user added prometheus.io/scrape: true in the service's annotation. This reduced set of targets corresponds to Kubelet https-metrics scrape endpoints. In the previous example, we may not be interested in keeping track of specific subsystems labels anymore. relabel_configstargetmetric_relabel_configs relabel_configs drop relabel_configs: - source_labels: [__meta_ec2_tag_Name] regex: Example. . additional container ports of the pod, not bound to an endpoint port, are discovered as targets as well. See this example Prometheus configuration file I am attempting to retrieve metrics using an API and the curl response appears to be in the correct format. instance. The last path segment for a detailed example of configuring Prometheus for Docker Engine. Endpoints are limited to the kube-system namespace. IONOS SD configurations allows retrieving scrape targets from view raw prometheus.yml hosted with by GitHub , Prometheus . directly which has basic support for filtering nodes (currently by node Metric Scrape the kubernetes api server in the k8s cluster without any extra scrape config. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Both of these methods are implemented through Prometheuss metric filtering and relabeling feature, relabel_config. To play around with and analyze any regular expressions, you can use RegExr. Prometheus Cheatsheets My Cheatsheet Repository View on GitHub Prometheus Cheatsheets. However, its usually best to explicitly define these for readability. How can I 'join' two metrics in a Prometheus query? external labels send identical alerts. changed with relabeling, as demonstrated in the Prometheus hetzner-sd is it query? To view every metric that is being scraped for debugging purposes, the metrics addon agent can be configured to run in debug mode by updating the setting enabled to true under the debug-mode setting in ama-metrics-settings-configmap configmap. For each endpoint You can also manipulate, transform, and rename series labels using relabel_config. I have Prometheus scraping metrics from node exporters on several machines with a config like this: When viewed in Grafana, these instances are assigned rather meaningless IP addresses; instead, I would prefer to see their hostnames. The following table has a list of all the default targets that the Azure Monitor metrics addon can scrape by default and whether it's initially enabled. This solution stores data at scrape-time with the desired labels, no need for funny PromQL queries or hardcoded hacks. The __address__ label is set to the : address of the target. and serves as an interface to plug in custom service discovery mechanisms. Consider the following metric and relabeling step. A DNS-based service discovery configuration allows specifying a set of DNS to He Wu, Prometheus Users The `relabel_config` is applied to labels on the discovered scrape targets, while `metrics_relabel_config` is applied to metrics collected from scrape targets.. The cluster label appended to every time series scraped will use the last part of the full AKS cluster's ARM resourceID. address referenced in the endpointslice object one target is discovered. You can perform the following common action operations: For a full list of available actions, please see relabel_config from the Prometheus documentation. The __param_ The relabeling step calculates the MD5 hash of the concatenated label values modulo a positive integer N, resulting in a number in the range [0, N-1]. I've never encountered a case where that would matter, but hey sure if there's a better way, why not. write_relabel_configs is relabeling applied to samples before sending them The purpose of this post is to explain the value of Prometheus relabel_config block, the different places where it can be found, and its usefulness in taming Prometheus metrics. For each endpoint In those cases, you can use the relabel Posted by Ruan It expects an array of one or more label names, which are used to select the respective label values. instances. Allowlisting or keeping the set of metrics referenced in a Mixins alerting rules and dashboards can form a solid foundation from which to build a complete set of observability metrics to scrape and store. Finally, this configures authentication credentials and the remote_write queue. To update the scrape interval settings for any target, the customer can update the duration in default-targets-scrape-interval-settings setting for that target in ama-metrics-settings-configmap configmap. node_uname_info{nodename} -> instance -- I get a syntax error at startup. Any other characters else will be replaced with _. Aurora. A relabel_configs configuration allows you to keep or drop targets returned by a service discovery mechanism like Kubernetes service discovery or AWS EC2 instance service discovery. The nodes role is used to discover Swarm nodes. Mixins are a set of preconfigured dashboards and alerts. 1Prometheus. GCE SD configurations allow retrieving scrape targets from GCP GCE instances. config package - github.com/prometheus/prometheus/config - Go Packages The highest tagged major version is v2 . The __scheme__ and __metrics_path__ labels required for the replace, keep, drop, labelmap,labeldrop and labelkeep actions. node-exporter.yaml . This service discovery uses the public IPv4 address by default, by that can be The relabeling phase is the preferred and more powerful When we want to relabel one of the source the prometheus internal labels, __address__ which will be the given target including the port, then we apply regex: (. value is set to the specified default. Next, using relabel_configs, only Endpoints with the Service Label k8s_app=kubelet are kept. To further customize the default jobs to change properties such as collection frequency or labels, disable the corresponding default target by setting the configmap value for the target to false, and then apply the job using custom configmap. To filter by them at the metrics level, first keep them using relabel_configs by assigning a label name and then use metric_relabel_configs to filter. Follow the instructions to create, validate, and apply the configmap for your cluster. Please help improve it by filing issues or pull requests. Going back to our extracted values, and a block like this. has the same configuration format and actions as target relabeling. instance it is running on should have at least read-only permissions to the Relabeler allows you to visually confirm the rules implemented by a relabel config. job. Use metric_relabel_configs in a given scrape job to select which series and labels to keep, and to perform any label replacement operations. metadata and a single tag). IONOS Cloud API. Which is frowned on by upstream as an "antipattern" because apparently there is an expectation that instance be the only label whose value is unique across all metrics in the job. Blog | Training | Book | Privacy, relabel_configs vs metric_relabel_configs. Since kubernetes_sd_configs will also add any other Pod ports as scrape targets (with role: endpoints), we need to filter these out using the __meta_kubernetes_endpoint_port_name relabel config. will periodically check the REST endpoint for currently running tasks and prometheus prometheus server Pull Push . Prometheus K8SYaml K8S To enable allowlisting in Prometheus, use the keep and labelkeep actions with any relabeling configuration. If the endpoint is backed by a pod, all The configuration format is the same as the Prometheus configuration file. Next I tried metrics_relabel_configs but that doesn't seem to want to copy a label from a different metric, ie. As an example, consider the following two metrics. The labelmap action is used to map one or more label pairs to different label names. Why is there a voltage on my HDMI and coaxial cables? This is to ensure that different components that consume this label will adhere to the basic alphanumeric convention. You can use a relabel rule like this one in your prometheus job desription: In the prometheus Service Discovery you can first check the correct name of your label. // Config is the top-level configuration for Prometheus's config files. To learn more about the general format for a relabel_config block, please see relabel_config from the Prometheus docs. prometheus.yml This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Files may be provided in YAML or JSON format. This role uses the public IPv4 address by default. It has the same configuration format and actions as target relabeling. Scrape coredns service in the k8s cluster without any extra scrape config. as retrieved from the API server. filtering nodes (using filters). If we provide more than one name in the source_labels array, the result will be the content of their values, concatenated using the provided separator. Scrape info about the prometheus-collector container such as the amount and size of timeseries scraped. DigitalOcean SD configurations allow retrieving scrape targets from DigitalOcean's Relabeling and filtering at this stage modifies or drops samples before Prometheus ships them to remote storage. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Note that adding an additional scrape . in the following places, preferring the first location found: If Prometheus is running within GCE, the service account associated with the Dropping metrics at scrape time with Prometheus It's easy to get carried away by the power of labels with Prometheus. Robot API. Changes to all defined files are detected via disk watches Zookeeper. way to filter targets based on arbitrary labels. s. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Scrape node metrics without any extra scrape config. metric_relabel_configs are commonly used to relabel and filter samples before ingestion, and limit the amount of data that gets persisted to storage. Before applying these techniques, ensure that youre deduplicating any samples sent from high-availability Prometheus clusters. You may wish to check out the 3rd party Prometheus Operator, Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. First off, the relabel_configs key can be found as part of a scrape job definition. The first relabeling rule adds {__keep="yes"} label to metrics with mountpoint matching the given regex. Email [email protected] for help. Any relabel_config must have the same general structure: These default values should be modified to suit your relabeling use case. May 30th, 2022 3:01 am How can they help us in our day-to-day work? To learn more, please see Regular expression on Wikipedia. create a target for every app instance. Basics; Curated Examples; Example Queries; Scrape Configs; Recording Rules; External Sources; Basics. They allow us to filter the targets returned by our SD mechanism, as well as manipulate the labels it sets. And if one doesn't work you can always try the other! 2023 The Linux Foundation. sudo systemctl restart prometheus single target is generated. Alert configuration. The replace action is most useful when you combine it with other fields. Most users will only need to define one instance. Grafana Labs uses cookies for the normal operation of this website. I just came across this problem and the solution is to use a group_left to resolve this problem. For non-list parameters the Prometheuslabel_replace | by kameneko | penguin-lab | Medium Write Sign up Sign In 500 Apologies, but something went wrong on our end. The private IP address is used by default, but may be changed to the public IP Marathon SD configurations allow retrieving scrape targets using the The second relabeling rule adds {__keep="yes"} label to metrics with empty `mountpoint` label, e.g. . We have a generous free forever tier and plans for every use case. configuration file. relabel_configs. It uses the $NODE_IP environment variable, which is already set for every ama-metrics addon container to target a specific port on the node: Custom scrape targets can follow the same format using static_configs with targets using the $NODE_IP environment variable and specifying the port to scrape. At a high level, a relabel_config allows you to select one or more source label values that can be concatenated using a separator parameter. domain names which are periodically queried to discover a list of targets. Of course, we can do the opposite and only keep a specific set of labels and drop everything else. The pod role discovers all pods and exposes their containers as targets. The extracted string would then be set written out to the target_label and might result in {address="podname:8080}. address with relabeling. it gets scraped. One use for this is ensuring a HA pair of Prometheus servers with different valid JSON. See below for the configuration options for Lightsail discovery: Linode SD configurations allow retrieving scrape targets from Linode's When we configured Prometheus to run as a service, we specified the path of /etc/prometheus/prometheus.yml. If the extracted value matches the given regex, then replacement gets populated by performing a regex replace and utilizing any previously defined capture groups. Grafana Labs uses cookies for the normal operation of this website. And what can they actually be used for? I have installed Prometheus on the same server where my Django app is running. for a detailed example of configuring Prometheus with PuppetDB. Additional config for this answer: configuration. Hope you learned a thing or two about relabeling rules and that youre more comfortable with using them. OpenStack SD configurations allow retrieving scrape targets from OpenStack Nova Please find below an example from other exporter (blackbox), but same logic applies for node exporter as well. For details on custom configuration, see Customize scraping of Prometheus metrics in Azure Monitor. The currently supported methods of target discovery for a scrape config are either static_configs or kubernetes_sd_configs for specifying or discovering targets. This service discovery uses the main IPv4 address by default, which that be Prometheus queries: How to give a default label when it is missing? configuration file. They are applied to the label set of each target in order of their appearance A blog on monitoring, scale and operational Sanity. Brackets indicate that a parameter is optional. it was not set during relabeling. You can configure the metrics addon to scrape targets other than the default ones, using the same configuration format as the Prometheus configuration file. You can filter series using Prometheuss relabel_config configuration object. Step 2: Scrape Prometheus sources and import metrics. It reads a set of files containing a list of zero or more 5.6K subscribers in the PrometheusMonitoring community. and serves as an interface to plug in custom service discovery mechanisms. This will also reload any configured rule files. The target must reply with an HTTP 200 response. To bulk drop or keep labels, use the labelkeep and labeldrop actions. For example, you may have a scrape job that fetches all Kubernetes Endpoints using a kubernetes_sd_configs parameter. One use for this is to exclude time series that are too expensive to ingest. This set of targets consists of one or more Pods that have one or more defined ports.
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