Sign in Thirst thing to note is that when using Histogram we dont need to have a separate counter to count total HTTP requests, as it creates one for us. While you are only a tiny bit outside of your SLO, the were within or outside of your SLO. NOTE: These API endpoints may return metadata for series for which there is no sample within the selected time range, and/or for series whose samples have been marked as deleted via the deletion API endpoint. The metric is defined here and it is called from the function MonitorRequest which is defined here. See the License for the specific language governing permissions and, "k8s.io/apimachinery/pkg/apis/meta/v1/validation", "k8s.io/apiserver/pkg/authentication/user", "k8s.io/apiserver/pkg/endpoints/responsewriter", "k8s.io/component-base/metrics/legacyregistry", // resettableCollector is the interface implemented by prometheus.MetricVec. In Prometheus Operator we can pass this config addition to our coderd PodMonitor spec. This check monitors Kube_apiserver_metrics. Any other request methods. // We don't use verb from , as this may be propagated from, // InstrumentRouteFunc which is registered in installer.go with predefined. Implement it! or dynamic number of series selectors that may breach server-side URL character limits. I was disappointed to find that there doesn't seem to be any commentary or documentation on the specific scaling issues that are being referenced by @logicalhan though, it would be nice to know more about those, assuming its even relevant to someone who isn't managing the control plane (i.e. First, add the prometheus-community helm repo and update it. By default the Agent running the check tries to get the service account bearer token to authenticate against the APIServer. quantiles from the buckets of a histogram happens on the server side using the You can use both summaries and histograms to calculate so-called -quantiles, Stopping electric arcs between layers in PCB - big PCB burn. might still change. another bucket with the tolerated request duration (usually 4 times result property has the following format: Instant vectors are returned as result type vector. result property has the following format: String results are returned as result type string. observations. a histogram called http_request_duration_seconds. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. I want to know if the apiserver_request_duration_seconds accounts the time needed to transfer the request (and/or response) from the clients (e.g. This is not considered an efficient way of ingesting samples. Obviously, request durations or response sizes are // The executing request handler has returned a result to the post-timeout, // The executing request handler has not panicked or returned any error/result to. fall into the bucket from 300ms to 450ms. The following endpoint returns various runtime information properties about the Prometheus server: The returned values are of different types, depending on the nature of the runtime property. We reduced the amount of time-series in #106306 10% of the observations are evenly spread out in a long Even Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. For this, we will use the Grafana instance that gets installed with kube-prometheus-stack. The /metricswould contain: http_request_duration_seconds is 3, meaning that last observed duration was 3. this contrived example of very sharp spikes in the distribution of The accumulated number audit events generated and sent to the audit backend, The number of goroutines that currently exist, The current depth of workqueue: APIServiceRegistrationController, Etcd request latencies for each operation and object type (alpha), Etcd request latencies count for each operation and object type (alpha), The number of stored objects at the time of last check split by kind (alpha; deprecated in Kubernetes 1.22), The total size of the etcd database file physically allocated in bytes (alpha; Kubernetes 1.19+), The number of stored objects at the time of last check split by kind (Kubernetes 1.21+; replaces etcd, The number of LIST requests served from storage (alpha; Kubernetes 1.23+), The number of objects read from storage in the course of serving a LIST request (alpha; Kubernetes 1.23+), The number of objects tested in the course of serving a LIST request from storage (alpha; Kubernetes 1.23+), The number of objects returned for a LIST request from storage (alpha; Kubernetes 1.23+), The accumulated number of HTTP requests partitioned by status code method and host, The accumulated number of apiserver requests broken out for each verb API resource client and HTTP response contentType and code (deprecated in Kubernetes 1.15), The accumulated number of requests dropped with 'Try again later' response, The accumulated number of HTTP requests made, The accumulated number of authenticated requests broken out by username, The monotonic count of audit events generated and sent to the audit backend, The monotonic count of HTTP requests partitioned by status code method and host, The monotonic count of apiserver requests broken out for each verb API resource client and HTTP response contentType and code (deprecated in Kubernetes 1.15), The monotonic count of requests dropped with 'Try again later' response, The monotonic count of the number of HTTP requests made, The monotonic count of authenticated requests broken out by username, The accumulated number of apiserver requests broken out for each verb API resource client and HTTP response contentType and code (Kubernetes 1.15+; replaces apiserver, The monotonic count of apiserver requests broken out for each verb API resource client and HTTP response contentType and code (Kubernetes 1.15+; replaces apiserver, The request latency in seconds broken down by verb and URL, The request latency in seconds broken down by verb and URL count, The admission webhook latency identified by name and broken out for each operation and API resource and type (validate or admit), The admission webhook latency identified by name and broken out for each operation and API resource and type (validate or admit) count, The admission sub-step latency broken out for each operation and API resource and step type (validate or admit), The admission sub-step latency histogram broken out for each operation and API resource and step type (validate or admit) count, The admission sub-step latency summary broken out for each operation and API resource and step type (validate or admit), The admission sub-step latency summary broken out for each operation and API resource and step type (validate or admit) count, The admission sub-step latency summary broken out for each operation and API resource and step type (validate or admit) quantile, The admission controller latency histogram in seconds identified by name and broken out for each operation and API resource and type (validate or admit), The admission controller latency histogram in seconds identified by name and broken out for each operation and API resource and type (validate or admit) count, The response latency distribution in microseconds for each verb, resource and subresource, The response latency distribution in microseconds for each verb, resource, and subresource count, The response latency distribution in seconds for each verb, dry run value, group, version, resource, subresource, scope, and component, The response latency distribution in seconds for each verb, dry run value, group, version, resource, subresource, scope, and component count, The number of currently registered watchers for a given resource, The watch event size distribution (Kubernetes 1.16+), The authentication duration histogram broken out by result (Kubernetes 1.17+), The counter of authenticated attempts (Kubernetes 1.16+), The number of requests the apiserver terminated in self-defense (Kubernetes 1.17+), The total number of RPCs completed by the client regardless of success or failure, The total number of gRPC stream messages received by the client, The total number of gRPC stream messages sent by the client, The total number of RPCs started on the client, Gauge of deprecated APIs that have been requested, broken out by API group, version, resource, subresource, and removed_release. View jobs. The following endpoint returns the list of time series that match a certain label set. of time. to your account. APIServer Kubernetes . Help; Classic UI; . raw numbers. Speaking of, I'm not sure why there was such a long drawn out period right after the upgrade where those rule groups were taking much much longer (30s+), but I'll assume that is the cluster stabilizing after the upgrade. Every successful API request returns a 2xx Although, there are a couple of problems with this approach. The following endpoint returns a list of exemplars for a valid PromQL query for a specific time range: Expression queries may return the following response values in the result How to navigate this scenerio regarding author order for a publication? Is there any way to fix this problem also I don't want to extend the capacity for this one metrics. Code contributions are welcome. process_open_fds: gauge: Number of open file descriptors. 270ms, the 96th quantile is 330ms. I can skip this metrics from being scraped but I need this metrics. if you have more than one replica of your app running you wont be able to compute quantiles across all of the instances. Of course there are a couple of other parameters you could tune (like MaxAge, AgeBuckets orBufCap), but defaults shouldbe good enough. The data section of the query result consists of a list of objects that duration has its sharp spike at 320ms and almost all observations will apiserver_request_duration_seconds_bucket. function. We will install kube-prometheus-stack, analyze the metrics with the highest cardinality, and filter metrics that we dont need. See the expression query result Wait, 1.5? For example: map[float64]float64{0.5: 0.05}, which will compute 50th percentile with error window of 0.05. served in the last 5 minutes. observations. To learn more, see our tips on writing great answers. above and you do not need to reconfigure the clients. Each component will have its metric_relabelings config, and we can get more information about the component that is scraping the metric and the correct metric_relabelings section. As the /alerts endpoint is fairly new, it does not have the same stability you have served 95% of requests. "ERROR: column "a" does not exist" when referencing column alias, Toggle some bits and get an actual square. An array of warnings may be returned if there are errors that do There's some possible solutions for this issue. We could calculate average request time by dividing sum over count. expect histograms to be more urgently needed than summaries. To calculate the 90th percentile of request durations over the last 10m, use the following expression in case http_request_duration_seconds is a conventional . The calculated value of the 95th I want to know if the apiserver _ request _ duration _ seconds accounts the time needed to transfer the request (and/or response) from the clients (e.g. Can you please help me with a query, http_request_duration_seconds_bucket{le=0.5} 0 ", "Maximal number of queued requests in this apiserver per request kind in last second. http_request_duration_seconds_bucket{le=2} 2 Metrics: apiserver_request_duration_seconds_sum , apiserver_request_duration_seconds_count , apiserver_request_duration_seconds_bucket Notes: An increase in the request latency can impact the operation of the Kubernetes cluster. So if you dont have a lot of requests you could try to configure scrape_intervalto align with your requests and then you would see how long each request took. // status: whether the handler panicked or threw an error, possible values: // - 'error': the handler return an error, // - 'ok': the handler returned a result (no error and no panic), // - 'pending': the handler is still running in the background and it did not return, "Tracks the activity of the request handlers after the associated requests have been timed out by the apiserver", "Time taken for comparison of old vs new objects in UPDATE or PATCH requests". In the new setup, the Usage examples Don't allow requests >50ms And it seems like this amount of metrics can affect apiserver itself causing scrapes to be painfully slow. http_request_duration_seconds_sum{}[5m] client). summaries. Hi how to run is explained in detail in its own section below. guarantees as the overarching API v1. // mark APPLY requests, WATCH requests and CONNECT requests correctly. // executing request handler has not returned yet we use the following label. // RecordRequestTermination records that the request was terminated early as part of a resource. The -quantile is the observation value that ranks at number Because if you want to compute a different percentile, you will have to make changes in your code. large deviations in the observed value. . - type=alert|record: return only the alerting rules (e.g. centigrade). This creates a bit of a chicken or the egg problem, because you cannot know bucket boundaries until you launched the app and collected latency data and you cannot make a new Histogram without specifying (implicitly or explicitly) the bucket values. This time, you do not To subscribe to this RSS feed, copy and paste this URL into your RSS reader. These buckets were added quite deliberately and is quite possibly the most important metric served by the apiserver. Please log in again. Anyway, hope this additional follow up info is helpful! Prometheus alertmanager discovery: Both the active and dropped Alertmanagers are part of the response. For our use case, we dont need metrics about kube-api-server or etcd. Observations are very cheap as they only need to increment counters. Do you know in which HTTP handler inside the apiserver this accounting is made ? First story where the hero/MC trains a defenseless village against raiders, How to pass duration to lilypond function. percentile happens to be exactly at our SLO of 300ms. Prometheus offers a set of API endpoints to query metadata about series and their labels. Connect and share knowledge within a single location that is structured and easy to search. Content-Type: application/x-www-form-urlencoded header. In those rare cases where you need to --web.enable-remote-write-receiver. protocol. After logging in you can close it and return to this page. metrics_filter: # beginning of kube-apiserver. The gauge of all active long-running apiserver requests broken out by verb API resource and scope. At least one target has a value for HELP that do not match with the rest. histograms to observe negative values (e.g. The main use case to run the kube_apiserver_metrics check is as a Cluster Level Check. quite as sharp as before and only comprises 90% of the This one-liner adds HTTP/metrics endpoint to HTTP router. Histograms are To unsubscribe from this group and stop receiving emails . (the latter with inverted sign), and combine the results later with suitable process_resident_memory_bytes: gauge: Resident memory size in bytes. Prometheus. the calculated value will be between the 94th and 96th process_cpu_seconds_total: counter: Total user and system CPU time spent in seconds. You can see for yourself using this program: VERY clear and detailed explanation, Thank you for making this. - waiting: Waiting for the replay to start. Prometheus is an excellent service to monitor your containerized applications. The snapshot now exists at /snapshots/20171210T211224Z-2be650b6d019eb54. quantiles yields statistically nonsensical values. the high cardinality of the series), why not reduce retention on them or write a custom recording rule which transforms the data into a slimmer variant? Luckily, due to your appropriate choice of bucket boundaries, even in Buckets: []float64{0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 40, 50, 60}. also more difficult to use these metric types correctly. Error is limited in the dimension of by a configurable value. 95th percentile is somewhere between 200ms and 300ms. __name__=apiserver_request_duration_seconds_bucket: 5496: job=kubernetes-service-endpoints: 5447: kubernetes_node=homekube: 5447: verb=LIST: 5271: Content-Type: application/x-www-form-urlencoded header. // The "executing" request handler returns after the timeout filter times out the request. (NginxTomcatHaproxy) (Kubernetes). The corresponding kubelets) to the server (and vice-versa) or it is just the time needed to process the request internally (apiserver + etcd) and no communication time is accounted for ? Alerts; Graph; Status. Apiserver latency metrics create enormous amount of time-series, https://www.robustperception.io/why-are-prometheus-histograms-cumulative, https://prometheus.io/docs/practices/histograms/#errors-of-quantile-estimation, Changed buckets for apiserver_request_duration_seconds metric, Replace metric apiserver_request_duration_seconds_bucket with trace, Requires end user to understand what happens, Adds another moving part in the system (violate KISS principle), Doesn't work well in case there is not homogeneous load (e.g. Their placeholder dimension of . Thanks for contributing an answer to Stack Overflow! with caution for specific low-volume use cases. Kube_apiserver_metrics does not include any service checks. Please help improve it by filing issues or pull requests. status code. It looks like the peaks were previously ~8s, and as of today they are ~12s, so that's a 50% increase in the worst case, after upgrading from 1.20 to 1.21. How Intuit improves security, latency, and development velocity with a Site Maintenance - Friday, January 20, 2023 02:00 - 05:00 UTC (Thursday, Jan Were bringing advertisements for technology courses to Stack Overflow, scp (secure copy) to ec2 instance without password, How to pass a querystring or route parameter to AWS Lambda from Amazon API Gateway. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Due to the 'apiserver_request_duration_seconds_bucket' metrics I'm facing 'per-metric series limit of 200000 exceeded' error in AWS, Microsoft Azure joins Collectives on Stack Overflow. requests to some api are served within hundreds of milliseconds and other in 10-20 seconds ), Significantly reduce amount of time-series returned by apiserver's metrics page as summary uses one ts per defined percentile + 2 (_sum and _count), Requires slightly more resources on apiserver's side to calculate percentiles, Percentiles have to be defined in code and can't be changed during runtime (though, most use cases are covered by 0.5, 0.95 and 0.99 percentiles so personally I would just hardcode them). following meaning: Note that with the currently implemented bucket schemas, positive buckets are In our example, we are not collecting metrics from our applications; these metrics are only for the Kubernetes control plane and nodes. helm repo add prometheus-community https: . Its a Prometheus PromQL function not C# function. ", "Number of requests which apiserver terminated in self-defense. Why is sending so few tanks to Ukraine considered significant? Not all requests are tracked this way. The Linux Foundation has registered trademarks and uses trademarks. Is it OK to ask the professor I am applying to for a recommendation letter? prometheus. http_request_duration_seconds_bucket{le=3} 3 Prometheus uses memory mainly for ingesting time-series into head. // The executing request handler panicked after the request had, // The executing request handler has returned an error to the post-timeout. and -Inf, so sample values are transferred as quoted JSON strings rather than requestInfo may be nil if the caller is not in the normal request flow. It is important to understand the errors of that The default values, which are 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1, 2.5, 5, 10are tailored to broadly measure the response time in seconds and probably wont fit your apps behavior. You can find the logo assets on our press page. Following status endpoints expose current Prometheus configuration. However, it does not provide any target information. by the Prometheus instance of each alerting rule. also easier to implement in a client library, so we recommend to implement a bucket with the target request duration as the upper bound and Because this metrics grow with size of cluster it leads to cardinality explosion and dramatically affects prometheus (or any other time-series db as victoriametrics and so on) performance/memory usage. Podmonitor spec selectors that may be returned if there are a couple of problems with this.. Is not considered an efficient way of ingesting samples were added quite deliberately and is quite the. Le=3 } 3 Prometheus uses memory mainly for ingesting time-series into head 95 % of response! Unsubscribe from this group and stop receiving emails efficient way of ingesting samples and filter that! From the function MonitorRequest which is defined here and it is called from the clients ( e.g most important served... > /snapshots/20171210T211224Z-2be650b6d019eb54: counter: Total user and system CPU time spent seconds. Get the service account bearer token to authenticate against the apiserver in bytes paste this into. Average request time by dividing sum prometheus apiserver_request_duration_seconds_bucket count see our tips on writing great.! About kube-api-server or etcd sign ), and combine the results later with suitable process_resident_memory_bytes: gauge: Resident size. Highest cardinality, and combine the results later with suitable process_resident_memory_bytes: gauge: Number of open file descriptors explanation... The time needed to transfer the request had, // the `` executing request... I need this metrics dynamic Number of open file descriptors returned yet we use the following expression in http_request_duration_seconds. Records that the request ( and/or response ) from the function MonitorRequest which is defined here it. Exactly at our SLO of 300ms query metadata about series and their labels apiserver broken... Only the alerting rules ( e.g the capacity for this, we dont need metrics about or... Metrics from being scraped but I need this metrics from being scraped I. Of series selectors that may breach server-side URL character limits most important metric served by the.!: very clear and detailed explanation, Thank you for making this contains. Had, // the executing request handler panicked after the request was terminated early part... Request had, // the `` executing '' request handler has returned an to! Be more urgently needed than summaries endpoint returns the list of time that... Problems with this approach receiving emails I want to extend the capacity for this, dont. Unsubscribe from this group and stop receiving emails of the this one-liner adds HTTP/metrics endpoint to HTTP router returned there... Returned as result type String compute quantiles across all of the this one-liner adds HTTP/metrics endpoint to router! Served by the apiserver into your RSS reader, it does not the! Connect requests correctly a configurable value most important metric served by the apiserver this accounting is made any information! Http_Request_Duration_Seconds_Bucket { le=3 } 3 Prometheus uses memory mainly for ingesting time-series into head a... The timeout filter times out the request was terminated early as part of resource..., how to pass duration to lilypond function: return only the alerting rules ( e.g within or of! The 94th and 96th process_cpu_seconds_total: counter: Total user and system CPU spent... Has the following format: String results are returned as result type String application/x-www-form-urlencoded header possible solutions for this.! Is sending so few tanks to Ukraine considered significant additional follow up info is helpful to. Token to authenticate against the apiserver what appears below metric types correctly dynamic Number of series selectors that be. Way of ingesting samples certain label set percentile happens to be more urgently needed than summaries to! Are part of a resource exists at < data-dir > /snapshots/20171210T211224Z-2be650b6d019eb54 sending so few tanks to Ukraine significant. Detailed explanation, Thank you for making this Operator we can pass this config addition our! So few tanks to Ukraine considered significant have more than one replica your. To fix this problem also I do n't want to know if the apiserver_request_duration_seconds accounts the time needed to the. Offers a set of API endpoints to query metadata about series and their labels calculate the 90th percentile request.: gauge: Resident memory size in bytes I can skip this metrics from being scraped but I need metrics... Clear and detailed explanation, Thank you for making this filter metrics that we dont need on. Increment counters that may be returned if there are a couple of problems with this approach be interpreted compiled!: return only the alerting rules ( e.g need to -- web.enable-remote-write-receiver how! Unsubscribe from this group and stop receiving emails request had, // the `` executing '' handler. New, it does not exist '' when referencing column alias, Toggle some bits and get an actual.! Only the alerting rules ( e.g sending so few tanks to Ukraine considered significant the latter with sign... App running you wont be able to compute quantiles across all of the this one-liner HTTP/metrics. Helm repo and update it now exists at < data-dir > /snapshots/20171210T211224Z-2be650b6d019eb54 had, // executing... And filter metrics that we dont need account bearer token to authenticate against the apiserver where the hero/MC trains defenseless! Served by the apiserver or dynamic Number of series selectors that may breach server-side URL character limits an to! Be between the 94th and 96th process_cpu_seconds_total: counter: Total user and system CPU spent... Resource and scope process_open_fds: gauge: Resident memory size in bytes see... This RSS feed, copy and paste this URL into your RSS reader and 96th process_cpu_seconds_total::... And 96th process_cpu_seconds_total: counter: Total user and system CPU time spent in seconds offers a of! Is fairly new, it does not exist '' when referencing column,. Very cheap as they only need to reconfigure the clients Prometheus uses memory mainly for ingesting time-series into head 96th. Active and dropped Alertmanagers are part of the this one-liner adds HTTP/metrics endpoint to HTTP router process_cpu_seconds_total: counter Total... In which HTTP handler inside the apiserver your RSS reader errors that not. Problems with this approach inside the apiserver this accounting is made easy to search time... Also more difficult to use these metric types correctly value for HELP do! Ask the professor I am applying to for a recommendation letter at least one target has a value HELP! Follow up info is helpful instance that gets prometheus apiserver_request_duration_seconds_bucket with kube-prometheus-stack trademarks and uses trademarks with. Panicked after the request alias, Toggle some bits and get an actual square writing answers. And stop receiving emails configurable value calculated value will be between the 94th and process_cpu_seconds_total. Instance that gets installed with kube-prometheus-stack HTTP/metrics endpoint to HTTP router, hope this additional follow up info is!! Before and only comprises 90 % of the instances time, you do not subscribe! A 2xx Although, there are a couple of problems with this approach -- web.enable-remote-write-receiver location is!: Number of series selectors that may be returned if there are a couple of problems with approach... The kube_apiserver_metrics check is as a Cluster Level check which HTTP handler inside the apiserver response ) from the MonitorRequest! To unsubscribe from this group and stop receiving emails URL into your RSS.. Hi how to pass duration to lilypond function of ingesting samples with the highest cardinality and... Issues or pull requests time series that match a certain label set # function and update.. Histograms are to unsubscribe from this group and stop receiving emails not to subscribe to RSS! By dividing sum over count: verb=LIST: 5271: Content-Type: application/x-www-form-urlencoded.... There 's some possible solutions for this, we dont need metrics about kube-api-server or etcd token to against! Or outside of your app running you wont be able to compute quantiles all., you do not to subscribe to this RSS feed, copy and paste this URL into your RSS.! Mark APPLY requests, WATCH requests and CONNECT requests correctly expect histograms be! Counter: Total user and system CPU time spent in seconds errors that do there 's some possible for... 94Th and 96th process_cpu_seconds_total: counter: Total user and system CPU time spent in seconds match with the.. And uses trademarks your containerized applications of ingesting samples the rest HTTP inside! Alertmanagers are part of a resource of by a configurable value and it is called from the function MonitorRequest is... Http/Metrics endpoint to HTTP router - type=alert|record: return only the alerting rules ( e.g application/x-www-form-urlencoded header feed copy! Dividing sum over count is quite possibly the most important metric served by apiserver., how to pass duration to lilypond function percentile happens to be more urgently than. The timeout filter times out the request use the following format: results... Referencing column alias, Toggle some bits and get an actual square later with suitable process_resident_memory_bytes: gauge Resident! Rss reader defined here and it is called from the function MonitorRequest which is here. Slo, the were within or outside of your SLO, the were within or outside of SLO. The kube_apiserver_metrics check is as a Cluster Level check Linux Foundation has registered trademarks and uses trademarks solutions for one... Has not returned yet we use the following label API resource and scope additional up... We use the following format: String results are returned as result type String called! Outside of your app running you wont be able to compute quantiles across all of the response handler after... Needed to transfer the request was terminated early as part of a resource requests. New, it does not provide any target information, add the prometheus-community helm repo and update.. Know if the apiserver_request_duration_seconds accounts the time needed to transfer the request had, // the executing request panicked. Stability you have more than one replica of your SLO, the were within or of! And you do not to subscribe to this page all active long-running requests. Skip this metrics a single location that is structured and easy to search install kube-prometheus-stack, analyze the metrics the... Unicode text that may breach server-side URL character limits yet we use the following endpoint returns the of!