prometheus relabel_configs vs metric_relabel_configs

), the One of the following roles can be configured to discover targets: The services role discovers all Swarm services rev2023.3.3.43278. Denylisting: This involves dropping a set of high-cardinality unimportant metrics that you explicitly define, and keeping everything else. The account must be a Triton operator and is currently required to own at least one container. You can apply a relabel_config to filter and manipulate labels at the following stages of metric collection: This sample configuration file skeleton demonstrates where each of these sections lives in a Prometheus config: Use relabel_configs in a given scrape job to select which targets to scrape. This SD discovers resources and will create a target for each resource returned Mixins are a set of preconfigured dashboards and alerts. for a practical example on how to set up Uyuni Prometheus configuration. Using metric_relabel_configs, you can drastically reduce your Prometheus metrics usage by throwing out unneeded samples. My target configuration was via IP addresses (, it should work with hostnames and ips, since the replacement regex would split at. Omitted fields take on their default value, so these steps will usually be shorter. By using the following relabel_configs snippet, you can limit scrape targets for this job to those whose Service label corresponds to app=nginx and port name to web: The initial set of endpoints fetched by kuberentes_sd_configs in the default namespace can be very large depending on the apps youre running in your cluster. Prometheus is configured via command-line flags and a configuration file. By default, for all the default targets, only minimal metrics used in the default recording rules, alerts, and Grafana dashboards are ingested as described in minimal-ingestion-profile. "After the incident", I started to be more careful not to trip over things. Metric relabeling is applied to samples as the last step before ingestion. relabeling. A consists of seven fields. is it query? You can't relabel with a nonexistent value in the request, you are limited to the different parameters that you gave to Prometheus or those that exists in the module use for the request (gcp,aws.). By default, instance is set to __address__, which is $host:$port. It also provides parameters to configure how to by the API. s. For users with thousands of containers it You can add additional metric_relabel_configs sections that replace and modify labels here. See below for the configuration options for OpenStack discovery: OVHcloud SD configurations allow retrieving scrape targets from OVHcloud's dedicated servers and VPS using See below for the configuration options for GCE discovery: Credentials are discovered by the Google Cloud SDK default client by looking // Config is the top-level configuration for Prometheus's config files. While NodeLegacyHostIP, and NodeHostName. However, its usually best to explicitly define these for readability. Theoretically Correct vs Practical Notation, Using indicator constraint with two variables, Linear regulator thermal information missing in datasheet. One of the following role types can be configured to discover targets: The node role discovers one target per cluster node with the address defaulting this functionality. record queries, but not the advanced DNS-SD approach specified in The regex supports parenthesized capture groups which can be referred to later on. Published by Brian Brazil in Posts Tags: prometheus, relabelling, service discovery Share on Blog | Training | Book | Privacy configuration file. Create Your Python's Custom Prometheus Exporter Tony DevOps in K8s K9s, Terminal Based UI to Manage Your Cluster Kirshi Yin in Better Programming How To Monitor a Spring Boot App With. The PromQL queries that power these dashboards and alerts reference a core set of important observability metrics. Tags: prometheus, relabelling. For details on custom configuration, see Customize scraping of Prometheus metrics in Azure Monitor. The labelmap action is used to map one or more label pairs to different label names. metrics_config The metrics_config block is used to define a collection of metrics instances. The scrape intervals have to be set by customer in the correct format specified here, else the default value of 30 seconds will be applied to the corresponding targets. Only alphanumeric characters are allowed. Once Prometheus is running, you can use PromQL queries to see how the metrics are evolving over time, such as rate (node_cpu_seconds_total [1m]) to observe CPU usage: While the node exporter does a great job of producing machine-level metrics on Unix systems, it's not going to help you expose metrics for all of your other third-party applications. configuration file. The last relabeling rule drops all the metrics without {__keep="yes"} label. Once the targets have been defined, the metric_relabel_configs steps are applied after the scrape and allow us to select which series we would like to ingest into Prometheus storage. Using metric_relabel_configs, you can drastically reduce your Prometheus metrics usage by throwing out unneeded samples. Any label pairs whose names match the provided regex will be copied with the new label name given in the replacement field, by utilizing group references (${1}, ${2}, etc). If were using Prometheus Kubernetes SD, our targets would temporarily expose some labels such as: Labels starting with double underscores will be removed by Prometheus after relabeling steps are applied, so we can use labelmap to preserve them by mapping them to a different name. The service role discovers a target for each service port for each service. to the Kubelet's HTTP port. filtering containers (using filters). These relabeling steps are applied before the scrape occurs and only have access to labels added by Prometheus Service Discovery. For all targets discovered directly from the endpoints list (those not additionally inferred Labels starting with __ will be removed from the label set after target The cluster label appended to every time series scraped will use the last part of the full AKS cluster's ARM resourceID. For example, when measuring HTTP latency, we might use labels to record the HTTP method and status returned, which endpoint was called, and which server was responsible for the request. For users with thousands of tasks it and applied immediately. Scrape node metrics without any extra scrape config. Additionally, relabel_configs allow selecting Alertmanagers from discovered If a job is using kubernetes_sd_configs to discover targets, each role has associated __meta_* labels for metrics. Docker SD configurations allow retrieving scrape targets from Docker Engine hosts. changed with relabeling, as demonstrated in the Prometheus scaleway-sd - ip-192-168-64-29.multipass:9100 determines the relabeling action to take: Care must be taken with labeldrop and labelkeep to ensure that metrics are For each endpoint When we configured Prometheus to run as a service, we specified the path of /etc/prometheus/prometheus.yml. the target and vary between mechanisms. 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. prometheus prometheus server Pull Push . 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. Add a new label called example_label with value example_value to every metric of the job. Prometheus metric_relabel_configs . 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. Connect and share knowledge within a single location that is structured and easy to search. The endpoints role discovers targets from listed endpoints of a service. ), but not system components (kubelet, node-exporter, kube-scheduler, .,) system components do not need most of the labels (endpoint . contexts. 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. Sending data from multiple high-availability Prometheus instances, relabel_configs vs metric_relabel_configs, Advanced Service Discovery in Prometheus 0.14.0, Relabel_config in a Prometheus configuration file, Scrape target selection using relabel_configs, Metric and label selection using metric_relabel_configs, Controlling remote write behavior using write_relabel_configs, Samples and labels to ingest into Prometheus storage, Samples and labels to ship to remote storage. instances it can be more efficient to use the EC2 API directly which has engine. . The regex is How can they help us in our day-to-day work? Next, using relabel_configs, only Endpoints with the Service Label k8s_app=kubelet are kept. - Key: Name, Value: pdn-server-1 One use for this is to exclude time series that are too expensive to ingest. The Find centralized, trusted content and collaborate around the technologies you use most. kube-state-metricsAPI ServerDeploymentNodePodkube-state-metricsmetricsPrometheus . The IAM credentials used must have the ec2:DescribeInstances permission to Grafana Cloud is the easiest way to get started with metrics, logs, traces, and dashboards. To bulk drop or keep labels, use the labelkeep and labeldrop actions. Both of these methods are implemented through Prometheuss metric filtering and relabeling feature, relabel_config. it was not set during relabeling. See this example Prometheus configuration file Use __address__ as the source label only because that label will always exist and will add the label for every target of the job. view raw prometheus.yml hosted with by GitHub , Prometheus . Prometheus relabel_configs 4. See below for the configuration options for Lightsail discovery: Linode SD configurations allow retrieving scrape targets from Linode's metric_relabel_configs offers one way around that. sending a HTTP POST request to the /-/reload endpoint (when the --web.enable-lifecycle flag is enabled). Relabel configs allow you to select which targets you want scraped, and what the target labels will be. Next I tried metrics_relabel_configs but that doesn't seem to want to copy a label from a different metric, ie. The pod role discovers all pods and exposes their containers as targets. How is an ETF fee calculated in a trade that ends in less than a year? Or if we were in an environment with multiple subsystems but only wanted to monitor kata, we could keep specific targets or metrics about it and drop everything related to other services. create a target group for every app that has at least one healthy task. There is a list of type Config struct {GlobalConfig GlobalConfig `yaml:"global"` AlertingConfig AlertingConfig `yaml:"alerting,omitempty"` RuleFiles []string `yaml:"rule_files,omitempty"` ScrapeConfigs []*ScrapeConfig `yaml:"scrape_configs,omitempty"` . with this feature. An example might make this clearer. In advanced configurations, this may change. Initially, aside from the configured per-target labels, a target's job Each pod of the daemonset will take the config, scrape the metrics, and send them for that node. As metric_relabel_configs are applied to every scraped timeseries, it is better to improve instrumentation rather than using metric_relabel_configs as a workaround on the Prometheus side. configuration file, the Prometheus linode-sd Prometheus supports relabeling, which allows performing the following tasks: Adding new label Updating existing label Rewriting existing label Updating metric name Removing unneeded labels. Not the answer you're looking for? Where must be unique across all scrape configurations. One use for this is ensuring a HA pair of Prometheus servers with different I'm working on file-based service discovery from a DB dump that will be able to write these targets out. configuration file. This can be The __meta_dockerswarm_network_* meta labels are not populated for ports which Relabeling 4.1 . You can't relabel with a nonexistent value in the request, you are limited to the different parameters that you gave to Prometheus or those that exists in the module use for the request (gcp,aws). There is a list of 3. This will also reload any configured rule files. (relabel_config) prometheus . Nomad SD configurations allow retrieving scrape targets from Nomad's As we saw before, the following block will set the env label to the replacement provided, so {env="production"} will be added to the labelset. 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]. They also serve as defaults for other configuration sections. could be used to limit which samples are sent. The role will try to use the public IPv4 address as default address, if there's none it will try to use the IPv6 one. 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. Alertmanagers may be statically configured via the static_configs parameter or We could offer this as an alias, to allow config file transition for Prometheus 3.x. I am attempting to retrieve metrics using an API and the curl response appears to be in the correct format. 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. First off, the relabel_configs key can be found as part of a scrape job definition. in the file_sd_configs: Solution: If you want to retain these labels, the relabel_configs can rewrite the label multiple times be done the following way: Doing it like this, the manually-set instance in sd_configs takes precedence, but if it's not set the port is still stripped away. changed with relabeling, as demonstrated in the Prometheus scaleway-sd Using a standard prometheus config to scrape two targets: refresh interval. support for filtering instances. Service API. Note that adding an additional scrape . This block would match the two values we previously extracted, However, this block would not match the previous labels and would abort the execution of this specific relabel step. It does so by replacing the labels for scraped data by regexes with relabel_configs. Published by Brian Brazil in Posts. address defaults to the host_ip attribute of the hypervisor. Finally, use write_relabel_configs in a remote_write configuration to select which series and labels to ship to remote storage. dynamically discovered using one of the supported service-discovery mechanisms. Using the __meta_kubernetes_service_label_app label filter, endpoints whose corresponding services do not have the app=nginx label will be dropped by this scrape job. interface. There is a small demo of how to use relabeling phase. We must make sure that all metrics are still uniquely labeled after applying labelkeep and labeldrop rules. The private IP address is used by default, but may be changed to the public IP Refer to Apply config file section to create a configmap from the prometheus config. Reducing Prometheus metrics usage with relabeling, Common use cases for relabeling in Prometheus, The targets scrape interval (experimental), Special labels set set by the Service Discovery mechanism, Special prefix used to temporarily store label values before discarding them, When you want to ignore a subset of applications; use relabel_config, When splitting targets between multiple Prometheus servers; use relabel_config + hashmod, When you want to ignore a subset of high cardinality metrics; use metric_relabel_config, When sending different metrics to different endpoints; use write_relabel_config. However, in some I'm not sure if that's helpful. The configuration format is the same as the Prometheus configuration file. Scrape the kubernetes api server in the k8s cluster without any extra scrape config. configuration file. The relabel_config step will use this number to populate the target_label with the result of the MD5(extracted value) % modulus expression. instance. Sign up for free now! Metric WindowsyamlLinux. their API. tsdb lets you configure the runtime-reloadable configuration settings of the TSDB. Prom Labss Relabeler tool may be helpful when debugging relabel configs. For users with thousands of valid JSON. Because this prometheus instance resides in the same VPC, I am using the __meta_ec2_private_ip which is the private ip address of the EC2 instance to assign it to the address where it needs to scrape the node exporter metrics endpoint: You will need a EC2 Ready Only instance role (or access keys on the configuration) in order for prometheus to read the EC2 tags on your account. 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. Each target has a meta label __meta_url during the Going back to our extracted values, and a block like this. This SD discovers "monitoring assignments" based on Kuma Dataplane Proxies, the cluster state. It is the canonical way to specify static targets in a scrape We drop all ports that arent named web. Does Counterspell prevent from any further spells being cast on a given turn? Use Grafana to turn failure into resilience. It may be a factor that my environment does not have DNS A or PTR records for the nodes in question. Prometheus Authors 2014-2023 | Documentation Distributed under CC-BY-4.0. The endpointslice role discovers targets from existing endpointslices. You can either create this configmap or edit an existing one. How do I align things in the following tabular environment? Prometheus communicate with these Alertmanagers. The following meta labels are available on all targets during relabeling: The labels below are only available for targets with role set to hcloud: The labels below are only available for targets with role set to robot: HTTP-based service discovery provides a more generic way to configure static targets https://stackoverflow.com/a/64623786/2043385. An alertmanager_config section specifies Alertmanager instances the Prometheus service port. I've been trying in vai for a month to find a coherent explanation of group_left, and expressions aren't labels. windows_exporter: enabled: true metric_relabel_configs: - source_labels: [__name__] regex: windows_system_system_up_time action: keep . Relabeling is a powerful tool that allows you to classify and filter Prometheus targets and metrics by rewriting their label set. via the MADS v1 (Monitoring Assignment Discovery Service) xDS API, and will create a target for each proxy Example scrape_configs: # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config. in the following places, preferring the first location found: If Prometheus is running within GCE, the service account associated with the Prometheuslabel_replace | by kameneko | penguin-lab | Medium Write Sign up Sign In 500 Apologies, but something went wrong on our end. I just came across this problem and the solution is to use a group_left to resolve this problem. would result in capturing whats before and after the @ symbol, swapping them around, and separating them with a slash. 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. *) regex captures the entire label value, replacement references this capture group, $1, when setting the new target_label. has the same configuration format and actions as target relabeling. Connect Grafana to data sources, apps, and more, with Grafana Alerting, Grafana Incident, and Grafana OnCall, Frontend application observability web SDK, Try out and share prebuilt visualizations, Contribute to technical documentation provided by Grafana Labs, Help build the future of open source observability software Yes, I know, trust me I don't like either but it's out of my control. Currently supported are the following sections: Any other unsupported sections need to be removed from the config before applying as a configmap. To view all available command-line flags, run ./prometheus -h. Prometheus can reload its configuration at runtime. The file is written in YAML format, But what about metrics with no labels? The address will be set to the host specified in the ingress spec. So as a simple rule of thumb: relabel_config happens before the scrape,metric_relabel_configs happens after the scrape. Enter relabel_configs, a powerful way to change metric labels dynamically. it gets scraped. To un-anchor the regex, use .*.*. The last path segment It Robot API. A static_config allows specifying a list of targets and a common label set 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. One is for the standard Prometheus configurations as documented in <scrape_config> in the Prometheus documentation. Files must contain a list of static configs, using these formats: As a fallback, the file contents are also re-read periodically at the specified Extracting labels from legacy metric names. EC2 SD configurations allow retrieving scrape targets from AWS EC2 Alert relabeling is applied to alerts before they are sent to the Alertmanager. It fetches targets from an HTTP endpoint containing a list of zero or more Furthermore, only Endpoints that have https-metrics as a defined port name are kept. Serversets are commonly as retrieved from the API server. Targets may be statically configured via the static_configs parameter or You can use a relabel_config to filter through and relabel: Youll learn how to do this in the next section. OpenStack SD configurations allow retrieving scrape targets from OpenStack Nova Most users will only need to define one instance. will periodically check the REST endpoint and So if you want to say scrape this type of machine but not that one, use relabel_configs. There are Mixins for Kubernetes, Consul, Jaeger, and much more. If the extracted value matches the given regex, then replacement gets populated by performing a regex replace and utilizing any previously defined capture groups. Use the metric_relabel_configs section to filter metrics after scraping. Also, your values need not be in single quotes. 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. Lightsail SD configurations allow retrieving scrape targets from AWS Lightsail As we did with Instance labelling in the last post, it'd be cool if we could show instance=lb1.example.com instead of an IP address and port. 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. instances, as well as configuration file. The address will be set to the Kubernetes DNS name of the service and respective

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