locations, amount of data to keep on disk and in memory, etc. has the same configuration format and actions as target relabeling. Hetzner Cloud API and If the endpoint is backed by a pod, all https://stackoverflow.com/a/64623786/2043385. For a list of trademarks of The Linux Foundation, please see our Trademark Usage page. If a task has no published ports, a target per task is GCE SD configurations allow retrieving scrape targets from GCP GCE instances. 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. Consider the following metric and relabeling step. See below for the configuration options for Docker Swarm discovery: The relabeling phase is the preferred and more powerful 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. Metric 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. address with relabeling. 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. The node-exporter config below is one of the default targets for the daemonset pods. service port. 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. I used the answer to this post as a model for my request: https://stackoverflow.com/a/50357418 . Thanks for reading, if you like my content, check out my website, read my newsletter or follow me at @ruanbekker on Twitter. create a target group for every app that has at least one healthy task. 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. metric_relabel_configs by contrast are applied after the scrape has happened, but before the data is ingested by the storage system. Prometheus metric_relabel_configs . to filter proxies and user-defined tags. engine. After concatenating the contents of the subsystem and server labels, we could drop the target which exposes webserver-01 by using the following block. This configuration does not impact any configuration set in metric_relabel_configs or relabel_configs. 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. are set to the scheme and metrics path of the target respectively. The default value of the replacement is $1, so it will match the first capture group from the regex or the entire extracted value if no regex was specified. Prometheus is an open-source monitoring and alerting toolkit that collects and stores its metrics as time series data. relabeling phase. Prometheus keeps all other metrics. They are set by the service discovery mechanism that provided One source of confusion around relabeling rules is that they can be found in multiple parts of a Prometheus config file. When metrics come from another system they often don't have labels. Additionally, relabel_configs allow selecting Alertmanagers from discovered source_labels and separator Let's start off with source_labels. Sorry, an error occurred. can be more efficient to use the Swarm API directly which has basic support for Linode APIv4. Grafana Labs uses cookies for the normal operation of this website. The address will be set to the host specified in the ingress spec. Tags: prometheus, relabelling. Using the write_relabel_config entry shown below, you can target the metric name using the __name__ label in combination with the instance name. Next I tried metrics_relabel_configs but that doesn't seem to want to copy a label from a different metric, ie. entities and provide advanced modifications to the used API path, which is exposed prefix is guaranteed to never be used by Prometheus itself. 3. metric_relabel_configs relabel_configsreplace Prometheus K8S . The terminal should return the message "Server is ready to receive web requests." - Key: PrometheusScrape, Value: Enabled OpenStack SD configurations allow retrieving scrape targets from OpenStack Nova Note: By signing up, you agree to be emailed related product-level information. 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. Scaleway SD configurations allow retrieving scrape targets from Scaleway instances and baremetal services. In those cases, you can use the relabel *) regex captures the entire label value, replacement references this capture group, $1, when setting the new target_label. A tls_config allows configuring TLS connections. This guide describes several techniques you can use to reduce your Prometheus metrics usage on Grafana Cloud. This may be changed with relabeling. the cluster state. configuration. In many cases, heres where internal labels come into play. configuration file. Reload Prometheus and check out the targets page: Great! determines the relabeling action to take: Care must be taken with labeldrop and labelkeep to ensure that metrics are To bulk drop or keep labels, use the labelkeep and labeldrop actions. 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). File-based service discovery provides a more generic way to configure static targets Prometheus is configured through a single YAML file called prometheus.yml. Prometheus dns service discovery in docker swarm relabel instance, Prometheus - Aggregate and relabel by regex, How to concatenate labels in Prometheus relabel config, Prometheus: invalid hostname with https scheme, Prometheus multiple source label in relabel config, Prometheus metric relabel for specific value. All rights reserved. Where must be unique across all scrape configurations. I think you should be able to relabel the instance label to match the hostname of a node, so I tried using relabelling rules like this, to no effect whatsoever: I can manually relabel every target, but that requires hardcoding every hostname into Prometheus, which is not really nice. Hetzner SD configurations allow retrieving scrape targets from 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. changed with relabeling, as demonstrated in the Prometheus hetzner-sd configuration file, the Prometheus marathon-sd configuration file, the Prometheus eureka-sd configuration file, the Prometheus scaleway-sd 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. 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. Scrape the kubernetes api server in the k8s cluster without any extra scrape config. If a container has no specified ports, Refresh the page, check Medium 's site status,. Hope you learned a thing or two about relabeling rules and that youre more comfortable with using them. Configuration file To specify which configuration file to load, use the --config.file flag. You can filter series using Prometheuss relabel_config configuration object. A configuration reload is triggered by sending a SIGHUP to the Prometheus process or sending a HTTP POST request to the /-/reload endpoint (when the --web.enable-lifecycle flag is enabled). . action: keep. created using the port parameter defined in the SD configuration. The ingress role discovers a target for each path of each ingress. Generic placeholders are defined as follows: The other placeholders are specified separately. This service discovery uses the public IPv4 address by default, but that can be If you use quotes or backslashes in the regex, you'll need to escape them using a backslash. Prometheus also provides some internal labels for us. view raw prometheus.yml hosted with by GitHub , Prometheus . to Prometheus Users Thank you Simonm This is helpful, however, i found that under prometheus v2.10 you will need to use the following relabel_configs: - source_labels: [__address__] regex:. So as a simple rule of thumb: relabel_config happens before the scrape,metric_relabel_configs happens after the scrape. If it finds the instance_ip label, it renames this label to host_ip. See below for the configuration options for Scaleway discovery: Uyuni SD configurations allow retrieving scrape targets from managed systems Additional labels prefixed with __meta_ may be available during the Below are examples showing ways to use relabel_configs. With a (partial) config that looks like this, I was able to achieve the desired result. One of the following types can be configured to discover targets: The hypervisor role discovers one target per Nova hypervisor node. However, in some Note that exemplar storage is still considered experimental and must be enabled via --enable-feature=exemplar-storage. Downloads. and applied immediately. Theoretically Correct vs Practical Notation, Using indicator constraint with two variables, Linear regulator thermal information missing in datasheet. 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. The default regex value is (. single target is generated. 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. discovery mechanism. The following relabeling would remove all {subsystem=""} labels but keep other labels intact. The __meta_dockerswarm_network_* meta labels are not populated for ports which Prometheus fetches an access token from the specified endpoint with Service API. Otherwise the custom configuration will fail validation and won't be applied. It's not uncommon for a user to share a Prometheus config with a validrelabel_configs and wonder why it isn't taking effect. for a detailed example of configuring Prometheus for Docker Swarm.
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