prometheus apiserver_request_duration_seconds_bucket

// the target removal release, in "." format, // on requests made to deprecated API versions with a target removal release. kubernetes-apps KubePodCrashLooping Now the request duration has its sharp spike at 320ms and almost all observations will fall into the bucket from 300ms to 450ms. time, or you configure a histogram with a few buckets around the 300ms labels represents the label set after relabeling has occurred. apply rate() and cannot avoid negative observations, you can use two Find more details here. The following endpoint returns currently loaded configuration file: The config is returned as dumped YAML file. buckets are Prometheus doesnt have a built in Timer metric type, which is often available in other monitoring systems. Why are there two different pronunciations for the word Tee? Following status endpoints expose current Prometheus configuration. actually most interested in), the more accurate the calculated value This can be used after deleting series to free up space. How to scale prometheus in kubernetes environment, Prometheus monitoring drilled down metric. (NginxTomcatHaproxy) (Kubernetes). metrics_filter: # beginning of kube-apiserver. Token APIServer Header Token . How does the number of copies affect the diamond distance? label instance="127.0.0.1:9090. The gauge of all active long-running apiserver requests broken out by verb API resource and scope. The sum of library, YAML comments are not included. // NormalizedVerb returns normalized verb, // If we can find a requestInfo, we can get a scope, and then. 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). High Error Rate Threshold: >3% failure rate for 10 minutes Hopefully by now you and I know a bit more about Histograms, Summaries and tracking request duration. or dynamic number of series selectors that may breach server-side URL character limits. a histogram called http_request_duration_seconds. single value (rather than an interval), it applies linear I've been keeping an eye on my cluster this weekend, and the rule group evaluation durations seem to have stabilised: That chart basically reflects the 99th percentile overall for rule group evaluations focused on the apiserver. Other values are ignored. There's some possible solutions for this issue. It does appear that the 90th percentile is roughly equivalent to where it was before the upgrade now, discounting the weird peak right after the upgrade. How does the number of copies affect the diamond distance? histograms first, if in doubt. calculated to be 442.5ms, although the correct value is close to /sig api-machinery, /assign @logicalhan Learn more about bidirectional Unicode characters. 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. 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. centigrade). Snapshot creates a snapshot of all current data into snapshots/- under the TSDB's data directory and returns the directory as response. prometheus. Regardless, 5-10s for a small cluster like mine seems outrageously expensive. Some explicitly within the Kubernetes API server, the Kublet, and cAdvisor or implicitly by observing events such as the kube-state . client). Then create a namespace, and install the chart. The other problem is that you cannot aggregate Summary types, i.e. The placeholder is an integer between 0 and 3 with the corrects for that. is explained in detail in its own section below. If there is a recommended approach to deal with this, I'd love to know what that is, as the issue for me isn't storage or retention of high cardinality series, its that the metrics endpoint itself is very slow to respond due to all of the time series. Not all requests are tracked this way. of the quantile is to our SLO (or in other words, the value we are inherently a counter (as described above, it only goes up). following meaning: Note that with the currently implemented bucket schemas, positive buckets are between clearly within the SLO vs. clearly outside the SLO. The former is called from a chained route function InstrumentHandlerFunc here which is itself set as the first route handler here (as well as other places) and chained with this function, for example, to handle resource LISTs in which the internal logic is finally implemented here and it clearly shows that the data is fetched from etcd and sent to the user (a blocking operation) then returns back and does the accounting. // TLSHandshakeErrors is a number of requests dropped with 'TLS handshake error from' error, "Number of requests dropped with 'TLS handshake error from' error", // Because of volatility of the base metric this is pre-aggregated one. Is there any way to fix this problem also I don't want to extend the capacity for this one metrics Here's a subset of some URLs I see reported by this metric in my cluster: Not sure how helpful that is, but I imagine that's what was meant by @herewasmike. It is automatic if you are running the official image k8s.gcr.io/kube-apiserver. You signed in with another tab or window. only in a limited fashion (lacking quantile calculation). For example calculating 50% percentile (second quartile) for last 10 minutes in PromQL would be: histogram_quantile(0.5, rate(http_request_duration_seconds_bucket[10m]), Wait, 1.5? Drop workspace metrics config. summary rarely makes sense. See the sample kube_apiserver_metrics.d/conf.yaml for all available configuration options. In Part 3, I dug deeply into all the container resource metrics that are exposed by the kubelet.In this article, I will cover the metrics that are exposed by the Kubernetes API server. between 270ms and 330ms, which unfortunately is all the difference I can skip this metrics from being scraped but I need this metrics. If you need to aggregate, choose histograms. In which directory does prometheus stores metric in linux environment? Furthermore, should your SLO change and you now want to plot the 90th I used c#, but it can not recognize the function. However, aggregating the precomputed quantiles from a View jobs. 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 ? another bucket with the tolerated request duration (usually 4 times Choose a JSON does not support special float values such as NaN, Inf, // of the total number of open long running requests. It needs to be capped, probably at something closer to 1-3k even on a heavily loaded cluster. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In that case, we need to do metric relabeling to add the desired metrics to a blocklist or allowlist. The main use case to run the kube_apiserver_metrics check is as a Cluster Level Check. GitHub kubernetes / kubernetes Public Notifications Fork 34.8k Star 95k Code Issues 1.6k Pull requests 789 Actions Projects 6 Security Insights New issue Replace metric apiserver_request_duration_seconds_bucket with trace #110742 Closed While you are only a tiny bit outside of your SLO, the calculated 95th quantile looks much worse. The /metricswould contain: http_request_duration_seconds is 3, meaning that last observed duration was 3. Note that the metric http_requests_total has more than one object in the list. In the Prometheus histogram metric as configured Oh and I forgot to mention, if you are instrumenting HTTP server or client, prometheus library has some helpers around it in promhttp package. How to save a selection of features, temporary in QGIS? The login page will open in a new tab. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Prometheus is an excellent service to monitor your containerized applications. The 94th quantile with the distribution described above is 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. words, if you could plot the "true" histogram, you would see a very It is important to understand the errors of that By default client exports memory usage, number of goroutines, Gargbage Collector information and other runtime information. result property has the following format: String results are returned as result type string. "Response latency distribution (not counting webhook duration) in seconds for each verb, group, version, resource, subresource, scope and component.". temperatures in Runtime & Build Information TSDB Status Command-Line Flags Configuration Rules Targets Service Discovery. PromQL expressions. expression query. First story where the hero/MC trains a defenseless village against raiders, How to pass duration to lilypond function. privacy statement. format. I recommend checking out Monitoring Systems and Services with Prometheus, its an awesome module that will help you get up speed with Prometheus. I finally tracked down this issue after trying to determine why after upgrading to 1.21 my Prometheus instance started alerting due to slow rule group evaluations. This documentation is open-source. For this, we will use the Grafana instance that gets installed with kube-prometheus-stack. requests served within 300ms and easily alert if the value drops below // The executing request handler panicked after the request had, // The executing request handler has returned an error to the post-timeout. // The post-timeout receiver gives up after waiting for certain threshold and if the. "Maximal number of currently used inflight request limit of this apiserver per request kind in last second. Histogram is made of a counter, which counts number of events that happened, a counter for a sum of event values and another counter for each of a bucket. We use cookies and other similar technology to collect data to improve your experience on our site, as described in our Two parallel diagonal lines on a Schengen passport stamp. How can I get all the transaction from a nft collection? In principle, however, you can use summaries and 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. 2020-10-12T08:18:00.703972307Z level=warn ts=2020-10-12T08:18:00.703Z caller=manager.go:525 component="rule manager" group=kube-apiserver-availability.rules msg="Evaluating rule failed" rule="record: Prometheus: err="query processing would load too many samples into memory in query execution" - Red Hat Customer Portal http_request_duration_seconds_bucket{le=3} 3 Well occasionally send you account related emails. - type=alert|record: return only the alerting rules (e.g. (the latter with inverted sign), and combine the results later with suitable Next step in our thought experiment: A change in backend routing Histograms and summaries both sample observations, typically request The following example returns all series that match either of the selectors If you are having issues with ingestion (i.e. percentile. The following example returns all metadata entries for the go_goroutines metric How To Distinguish Between Philosophy And Non-Philosophy? Connect and share knowledge within a single location that is structured and easy to search. (assigning to sig instrumentation) http_request_duration_seconds_sum{}[5m] Note that an empty array is still returned for targets that are filtered out. percentile, or you want to take into account the last 10 minutes le="0.3" bucket is also contained in the le="1.2" bucket; dividing it by 2 // we can convert GETs to LISTs when needed. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You can see for yourself using this program: VERY clear and detailed explanation, Thank you for making this. The JSON response envelope format is as follows: Generic placeholders are defined as follows: Note: Names of query parameters that may be repeated end with []. 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. Usage examples Don't allow requests >50ms 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. apiserver_request_duration_seconds_bucket. Find centralized, trusted content and collaborate around the technologies you use most. from one of my clusters: apiserver_request_duration_seconds_bucket metric name has 7 times more values than any other. apiserver/pkg/endpoints/metrics/metrics.go Go to file Go to fileT Go to lineL Copy path Copy permalink This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. // a request. The Linux Foundation has registered trademarks and uses trademarks. and -Inf, so sample values are transferred as quoted JSON strings rather than values. One would be allowing end-user to define buckets for apiserver. For example calculating 50% percentile (second quartile) for last 10 minutes in PromQL would be: histogram_quantile (0.5, rate (http_request_duration_seconds_bucket [10m]) Which results in 1.5. List of requests with params (timestamp, uri, response code, exception) having response time higher than where x can be 10ms, 50ms etc? Prometheus offers a set of API endpoints to query metadata about series and their labels. // Path the code takes to reach a conclusion: // i.e. 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. prometheus_http_request_duration_seconds_bucket {handler="/graph"} histogram_quantile () function can be used to calculate quantiles from histogram histogram_quantile (0.9,prometheus_http_request_duration_seconds_bucket {handler="/graph"}) 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 . 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, What's the difference between Apache's Mesos and Google's Kubernetes, Command to delete all pods in all kubernetes namespaces. Not mentioning both start and end times would clear all the data for the matched series in the database. tail between 150ms and 450ms. Asking for help, clarification, or responding to other answers. How many grandchildren does Joe Biden have? You received this message because you are subscribed to the Google Groups "Prometheus Users" group. Note that any comments are removed in the formatted string. and one of the following HTTP response codes: Other non-2xx codes may be returned for errors occurring before the API The same applies to etcd_request_duration_seconds_bucket; we are using a managed service that takes care of etcd, so there isnt value in monitoring something we dont have access to. Of course, it may be that the tradeoff would have been better in this case, I don't know what kind of testing/benchmarking was done. Due to limitation of the YAML The Kube_apiserver_metrics check is included in the Datadog Agent package, so you do not need to install anything else on your server. This causes anyone who still wants to monitor apiserver to handle tons of metrics. to your account. And with cluster growth you add them introducing more and more time-series (this is indirect dependency but still a pain point). To return a . Prometheus comes with a handyhistogram_quantilefunction for it. __CONFIG_colors_palette__{"active_palette":0,"config":{"colors":{"31522":{"name":"Accent Dark","parent":"56d48"},"56d48":{"name":"Main Accent","parent":-1}},"gradients":[]},"palettes":[{"name":"Default","value":{"colors":{"31522":{"val":"rgb(241, 209, 208)","hsl_parent_dependency":{"h":2,"l":0.88,"s":0.54}},"56d48":{"val":"var(--tcb-skin-color-0)","hsl":{"h":2,"s":0.8436,"l":0.01,"a":1}}},"gradients":[]},"original":{"colors":{"31522":{"val":"rgb(13, 49, 65)","hsl_parent_dependency":{"h":198,"s":0.66,"l":0.15,"a":1}},"56d48":{"val":"rgb(55, 179, 233)","hsl":{"h":198,"s":0.8,"l":0.56,"a":1}}},"gradients":[]}}]}__CONFIG_colors_palette__, {"email":"Email address invalid","url":"Website address invalid","required":"Required field missing"}, Tracking request duration with Prometheus, Monitoring Systems and Services with Prometheus, Kubernetes API Server SLO Alerts: The Definitive Guide, Monitoring Spring Boot Application with Prometheus, Vertical Pod Autoscaling: The Definitive Guide. requestInfo may be nil if the caller is not in the normal request flow. 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 ? All rights reserved. observations from a number of instances. // RecordDroppedRequest records that the request was rejected via http.TooManyRequests. When enabled, the remote write receiver What's the difference between ClusterIP, NodePort and LoadBalancer service types in Kubernetes? After logging in you can close it and return to this page. summaries. // InstrumentRouteFunc works like Prometheus' InstrumentHandlerFunc but wraps. Kube_apiserver_metrics does not include any events. this contrived example of very sharp spikes in the distribution of {quantile=0.9} is 3, meaning 90th percentile is 3. // normalize the legacy WATCHLIST to WATCH to ensure users aren't surprised by metrics. In that case, the sum of observations can go down, so you The data section of the query result consists of a list of objects that // ResponseWriterDelegator interface wraps http.ResponseWriter to additionally record content-length, status-code, etc. // This metric is used for verifying api call latencies SLO. a single histogram or summary create a multitude of time series, it is 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. summary if you need an accurate quantile, no matter what the This documentation is open-source. For a list of trademarks of The Linux Foundation, please see our Trademark Usage page. depending on the resultType. percentile happens to be exactly at our SLO of 300ms. Why is sending so few tanks to Ukraine considered significant? All rights reserved. // RecordRequestAbort records that the request was aborted possibly due to a timeout. a quite comfortable distance to your SLO. Go ,go,prometheus,Go,Prometheus,PrometheusGo var RequestTimeHistogramVec = prometheus.NewHistogramVec( prometheus.HistogramOpts{ Name: "request_duration_seconds", Help: "Request duration distribution", Buckets: []flo Alerts; Graph; Status. // receiver after the request had been timed out by the apiserver. In PromQL it would be: http_request_duration_seconds_sum / http_request_duration_seconds_count. The corresponding As a plus, I also want to know where this metric is updated in the apiserver's HTTP handler chains ? 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? // CanonicalVerb distinguishes LISTs from GETs (and HEADs). You can use, Number of time series (in addition to the. observations falling into particular buckets of observation The reason is that the histogram The following endpoint returns an overview of the current state of the By the way, be warned that percentiles can be easilymisinterpreted. In Prometheus Histogram is really a cumulative histogram (cumulative frequency). The following expression calculates it by job for the requests 2023 The Linux Foundation. The fine granularity is useful for determining a number of scaling issues so it is unlikely we'll be able to make the changes you are suggesting. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Prometheus can be configured as a receiver for the Prometheus remote write The sections below describe the API endpoints for each type of The following endpoint formats a PromQL expression in a prettified way: The data section of the query result is a string containing the formatted query expression. Though, histograms require one to define buckets suitable for the case. `code_verb:apiserver_request_total:increase30d` loads (too) many samples 2021-02-15 19:55:20 UTC Github openshift cluster-monitoring-operator pull 980: 0 None closed Bug 1872786: jsonnet: remove apiserver_request:availability30d 2021-02-15 19:55:21 UTC The query http_requests_bucket{le=0.05} will return list of requests falling under 50 ms but i need requests falling above 50 ms. Copyright 2021 Povilas Versockas - Privacy Policy. Note that native histograms are an experimental feature, and the format below helm repo add prometheus-community https: . Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. use the following expression: A straight-forward use of histograms (but not summaries) is to count In those rare cases where you need to // 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". type=alert) or the recording rules (e.g. total: The total number segments needed to be replayed. This bot triages issues and PRs according to the following rules: Please send feedback to sig-contributor-experience at kubernetes/community. First, you really need to know what percentiles you want. In Prometheus Operator we can pass this config addition to our coderd PodMonitor spec. Other -quantiles and sliding windows cannot be calculated later. 2015-07-01T20:10:51.781Z: The following endpoint evaluates an expression query over a range of time: For the format of the placeholder, see the range-vector result

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