Add native histogram support for histogram metrics (#9971)

Co-authored-by: Ricardo Katz <rikatz@users.noreply.github.com>

cmd/dataplane/main.go

@@ -66,7 +66,7 @@ func main() {
 	mc := metric.NewDummyCollector()
 	if conf.EnableMetrics {
 		// TODO: Ingress class is not a part of dataplane anymore
-		mc, err = metric.NewCollector(conf.MetricsPerHost, conf.ReportStatusClasses, reg, conf.IngressClassConfiguration.Controller, *conf.MetricsBuckets, conf.ExcludeSocketMetrics)
+		mc, err = metric.NewCollector(conf.MetricsPerHost, conf.ReportStatusClasses, reg, conf.IngressClassConfiguration.Controller, *conf.MetricsBuckets, conf.MetricsBucketFactor, conf.MetricsMaxBuckets, conf.ExcludeSocketMetrics)
 		if err != nil {
 			klog.Fatalf("Error creating prometheus collector:  %v", err)
 		}

cmd/nginx/main.go

@@ -130,7 +130,7 @@ func main() {
 
 	mc := metric.NewDummyCollector()
 	if conf.EnableMetrics {
-		mc, err = metric.NewCollector(conf.MetricsPerHost, conf.ReportStatusClasses, reg, conf.IngressClassConfiguration.Controller, *conf.MetricsBuckets, conf.ExcludeSocketMetrics)
+		mc, err = metric.NewCollector(conf.MetricsPerHost, conf.ReportStatusClasses, reg, conf.IngressClassConfiguration.Controller, *conf.MetricsBuckets, conf.MetricsBucketFactor, conf.MetricsMaxBuckets, conf.ExcludeSocketMetrics)
 		if err != nil {
 			klog.Fatalf("Error creating prometheus collector:  %v", err)
 		}

docs/user-guide/cli-arguments.md

@@ -8,6 +8,7 @@ They are set in the container spec of the `ingress-nginx-controller` Deployment
 |----------|-------------|
 | `--annotations-prefix`             | Prefix of the Ingress annotations specific to the NGINX controller. (default "nginx.ingress.kubernetes.io") |
 | `--apiserver-host`                 | Address of the Kubernetes API server. Takes the form "protocol://address:port". If not specified, it is assumed the program runs inside a Kubernetes cluster and local discovery is attempted. |
+| `--bucket-factor`                    | Bucket factor for native histograms. Value must be > 1 for enabling native histograms. (default 0) |
 | `--certificate-authority`          | Path to a cert file for the certificate authority. This certificate is used only when the flag --apiserver-host is specified. |
 | `--configmap`                      | Name of the ConfigMap containing custom global configurations for the controller. |
 | `--controller-class`                      | Ingress Class Controller value this Ingress satisfies. The class of an Ingress object is set using the field IngressClassName in Kubernetes clusters version v1.19.0 or higher. The .spec.controller value of the IngressClass referenced in an Ingress Object should be the same value specified here to make this object be watched. |
@@ -40,6 +41,7 @@ They are set in the container spec of the `ingress-nginx-controller` Deployment
 | `--internal-logger-address`        | Address to be used when binding internal syslogger. (default 127.0.0.1:11514) |
 | `--kubeconfig`                     | Path to a kubeconfig file containing authorization and API server information. |
 | `--length-buckets`                     | Set of buckets which will be used for prometheus histogram metrics such as RequestLength, ResponseLength. (default `[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]`) |
+| `--max-buckets`                      | Maximum number of buckets for native histograms. (default 100) |
 | `--maxmind-edition-ids`            | Maxmind edition ids to download GeoLite2 Databases. (default "GeoLite2-City,GeoLite2-ASN") |
 | `--maxmind-retries-timeout`        | Maxmind downloading delay between 1st and 2nd attempt, 0s - do not retry to download if something went wrong. (default 0s) |
 | `--maxmind-retries-count`          | Number of attempts to download the GeoIP DB. (default 1) |

go.work.sum

@@ -1,3 +1,4 @@
+cel.dev/expr v0.15.0 h1:O1jzfJCQBfL5BFoYktaxwIhuttaQPsVWerH9/EEKx0w=
 cel.dev/expr v0.15.0/go.mod h1:TRSuuV7DlVCE/uwv5QbAiW/v8l5O8C4eEPHeu7gf7Sg=
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 cloud.google.com/go v0.110.4/go.mod h1:+EYjdK8e5RME/VY/qLCAtuyALQ9q67dvuum8i+H5xsI=
@@ -123,6 +124,7 @@ cloud.google.com/go/cloudtasks v1.12.6/go.mod h1:b7c7fe4+TJsFZfDyzO51F7cjq7HLUlR
 cloud.google.com/go/compute v1.21.0/go.mod h1:4tCnrn48xsqlwSAiLf1HXMQk8CONslYbdiEZc9FEIbM=
 cloud.google.com/go/compute v1.23.0/go.mod h1:4tCnrn48xsqlwSAiLf1HXMQk8CONslYbdiEZc9FEIbM=
 cloud.google.com/go/compute v1.23.1/go.mod h1:CqB3xpmPKKt3OJpW2ndFIXnA9A4xAy/F3Xp1ixncW78=
+cloud.google.com/go/compute v1.23.3 h1:6sVlXXBmbd7jNX0Ipq0trII3e4n1/MsADLK6a+aiVlk=
 cloud.google.com/go/compute v1.23.3/go.mod h1:VCgBUoMnIVIR0CscqQiPJLAG25E3ZRZMzcFZeQ+h8CI=
 cloud.google.com/go/compute v1.24.0 h1:phWcR2eWzRJaL/kOiJwfFsPs4BaKq1j6vnpZrc1YlVg=
 cloud.google.com/go/compute v1.24.0/go.mod h1:kw1/T+h/+tK2LJK0wiPPx1intgdAM3j/g3hFDlscY40=
@@ -569,6 +571,8 @@ github.com/andybalholm/brotli v1.0.4 h1:V7DdXeJtZscaqfNuAdSRuRFzuiKlHSC/Zh3zl9qY
 github.com/antihax/optional v1.0.0 h1:xK2lYat7ZLaVVcIuj82J8kIro4V6kDe0AUDFboUCwcg=
 github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df h1:7RFfzj4SSt6nnvCPbCqijJi1nWCd+TqAT3bYCStRC18=
 github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df/go.mod h1:pSwJ0fSY5KhvocuWSx4fz3BA8OrA1bQn+K1Eli3BRwM=
+github.com/antlr4-go/antlr/v4 v4.13.0 h1:lxCg3LAv+EUK6t1i0y1V6/SLeUi0eKEKdhQAlS8TVTI=
+github.com/antlr4-go/antlr/v4 v4.13.0/go.mod h1:pfChB/xh/Unjila75QW7+VU4TSnWnnk9UTnmpPaOR2g=
 github.com/apache/arrow/go/v10 v10.0.1 h1:n9dERvixoC/1JjDmBcs9FPaEryoANa2sCgVFo6ez9cI=
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 github.com/apache/thrift v0.16.0 h1:qEy6UW60iVOlUy+b9ZR0d5WzUWYGOo4HfopoyBaNmoY=
@@ -583,6 +587,8 @@ github.com/bytedance/sonic v1.9.1 h1:6iJ6NqdoxCDr6mbY8h18oSO+cShGSMRGCEo7F2h0x8s
 github.com/bytedance/sonic v1.9.1/go.mod h1:i736AoUSYt75HyZLoJW9ERYxcy6eaN6h4BZXU064P/U=
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 github.com/cenkalti/backoff/v4 v4.2.1/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
+github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
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 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
@@ -615,6 +621,7 @@ github.com/cncf/xds/go v0.0.0-20231109132714-523115ebc101/go.mod h1:eXthEFrGJvWH
 github.com/cncf/xds/go v0.0.0-20231128003011-0fa0005c9caa h1:jQCWAUqqlij9Pgj2i/PB79y4KOPYVyFYdROxgaCwdTQ=
 github.com/cncf/xds/go v0.0.0-20231128003011-0fa0005c9caa/go.mod h1:x/1Gn8zydmfq8dk6e9PdstVsDgu9RuyIIJqAaF//0IM=
 github.com/cncf/xds/go v0.0.0-20240318125728-8a4994d93e50/go.mod h1:5e1+Vvlzido69INQaVO6d87Qn543Xr6nooe9Kz7oBFM=
+github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b h1:ga8SEFjZ60pxLcmhnThWgvH2wg8376yUJmPhEH4H3kw=
 github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b/go.mod h1:W+zGtBO5Y1IgJhy4+A9GOqVhqLpfZi+vwmdNXUehLA8=
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@@ -624,6 +631,7 @@ github.com/coreos/go-semver v0.3.1 h1:yi21YpKnrx1gt5R+la8n5WgS0kCrsPp33dmEyHReZr
 github.com/coreos/go-semver v0.3.1/go.mod h1:irMmmIw/7yzSRPWryHsK7EYSg09caPQL03VsM8rvUec=
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+github.com/cpuguy83/go-md2man/v2 v2.0.4 h1:wfIWP927BUkWJb2NmU/kNDYIBTh/ziUX91+lVfRxZq4=
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@@ -642,6 +650,7 @@ github.com/envoyproxy/protoc-gen-validate v1.0.4/go.mod h1:qys6tmnRsYrQqIhm2bvKZ
 github.com/evanphx/json-patch v4.12.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
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+github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
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@@ -678,6 +687,7 @@ github.com/go-openapi/jsonpointer v0.19.6/go.mod h1:osyAmYz/mB/C3I+WsTTSgw1ONzaL
 github.com/go-openapi/jsonreference v0.20.1/go.mod h1:Bl1zwGIM8/wsvqjsOQLJ/SH+En5Ap4rVB5KVcIDZG2k=
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@@ -703,6 +713,7 @@ github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF0
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@@ -711,6 +722,8 @@ github.com/google/btree v1.0.1/go.mod h1:xXMiIv4Fb/0kKde4SpL7qlzvu5cMJDRkFDxJfI9
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+github.com/google/cel-go v0.20.1 h1:nDx9r8S3L4pE61eDdt8igGj8rf5kjYR3ILxWIpWNi84=
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@@ -718,6 +731,8 @@ github.com/google/martian v2.1.0+incompatible h1:/CP5g8u/VJHijgedC/Legn3BAbAaWPg
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@@ -743,6 +758,8 @@ github.com/grpc-ecosystem/grpc-gateway v1.16.0 h1:gmcG1KaJ57LophUzW0Hy8NmPhnMZb4
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@@ -795,6 +812,8 @@ github.com/minio/asm2plan9s v0.0.0-20200509001527-cdd76441f9d8 h1:AMFGa4R4MiIpsp
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@@ -871,8 +890,6 @@ github.com/vishvananda/netlink v1.1.0 h1:1iyaYNBLmP6L0220aDnYQpo1QEV4t4hJ+xEEhhJ
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-github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
-github.com/x448/float16 v0.8.4/go.mod h1:14CWIYCyZA/cWjXOioeEpHeN/83MdbZDRQHoFcYsOfg=
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@@ -883,50 +900,84 @@ github.com/zeebo/assert v1.3.0 h1:g7C04CbJuIDKNPFHmsk4hwZDO5O+kntRxzaUoNXj+IQ=
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@@ -944,6 +995,7 @@ golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028 h1:4+4C/Iv2U4fMZBiMCc98MG
 golang.org/x/mod v0.9.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
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 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
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@@ -951,6 +1003,8 @@ golang.org/x/net v0.18.0/go.mod h1:/czyP5RqHAH4odGYxBJ1qz0+CE5WZ+2j1YgoEo8F2jQ=
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@@ -958,18 +1012,24 @@ golang.org/x/oauth2 v0.14.0/go.mod h1:lAtNWgaWfL4cm7j2OV8TxGi9Qb7ECORx8DktCY74Ow
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@@ -977,6 +1037,8 @@ golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58
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+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
+golang.org/x/tools v0.23.0/go.mod h1:pnu6ufv6vQkll6szChhK3C3L/ruaIv5eBeztNG8wtsI=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 h1:H2TDz8ibqkAF6YGhCdN3jS9O0/s90v0rJh3X/OLHEUk=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
 golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028/go.mod h1:NDW/Ps6MPRej6fsCIbMTohpP40sJ/P/vI1MoTEGwX90=
@@ -1022,6 +1084,7 @@ google.golang.org/genproto/googleapis/api v0.0.0-20240213162025-012b6fc9bca9/go.
 google.golang.org/genproto/googleapis/api v0.0.0-20240227224415-6ceb2ff114de h1:jFNzHPIeuzhdRwVhbZdiym9q0ory/xY3sA+v2wPg8I0=
 google.golang.org/genproto/googleapis/api v0.0.0-20240227224415-6ceb2ff114de/go.mod h1:5iCWqnniDlqZHrd3neWVTOwvh/v6s3232omMecelax8=
 google.golang.org/genproto/googleapis/api v0.0.0-20240318140521-94a12d6c2237/go.mod h1:Z5Iiy3jtmioajWHDGFk7CeugTyHtPvMHA4UTmUkyalE=
+google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157 h1:7whR9kGa5LUwFtpLm2ArCEejtnxlGeLbAyjFY8sGNFw=
 google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157/go.mod h1:99sLkeliLXfdj2J75X3Ho+rrVCaJze0uwN7zDDkjPVU=
 google.golang.org/genproto/googleapis/bytestream v0.0.0-20230530153820-e85fd2cbaebc h1:g3hIDl0jRNd9PPTs2uBzYuaD5mQuwOkZY0vSc0LR32o=
 google.golang.org/genproto/googleapis/bytestream v0.0.0-20231030173426-d783a09b4405/go.mod h1:GRUCuLdzVqZte8+Dl/D4N25yLzcGqqWaYkeVOwulFqw=
@@ -1064,6 +1127,8 @@ k8s.io/kms v0.29.3/go.mod h1:TBGbJKpRUMk59neTMDMddjIDL+D4HuFUbpuiuzmOPg0=
 k8s.io/kms v0.30.0 h1:ZlnD/ei5lpvUlPw6eLfVvH7d8i9qZ6HwUQgydNVks8g=
 k8s.io/kms v0.30.0/go.mod h1:GrMurD0qk3G4yNgGcsCEmepqf9KyyIrTXYR2lyUOJC4=
 k8s.io/kms v0.30.1/go.mod h1:GrMurD0qk3G4yNgGcsCEmepqf9KyyIrTXYR2lyUOJC4=
+k8s.io/kms v0.31.0 h1:KchILPfB1ZE+ka7223mpU5zeFNkmb45jl7RHnlImUaI=
+k8s.io/kms v0.31.0/go.mod h1:OZKwl1fan3n3N5FFxnW5C4V3ygrah/3YXeJWS3O6+94=
 k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340/go.mod h1:yD4MZYeKMBwQKVht279WycxKyM84kkAx2DPrTXaeb98=
 k8s.io/utils v0.0.0-20210802155522-efc7438f0176/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
 k8s.io/utils v0.0.0-20230726121419-3b25d923346b/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
@@ -1088,6 +1153,8 @@ rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.28.0/go.mod h1:VHVDI/KrK4fjnV61bE2g3sA7tiETLn8sooImelsCx3Y=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.29.0 h1:/U5vjBbQn3RChhv7P11uhYvCSm5G2GaIi5AIGBS6r4c=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.29.0/go.mod h1:z7+wmGM2dfIiLRfrC6jb5kV2Mq/sK1ZP303cxzkV5Y4=
+sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.30.3 h1:2770sDpzrjjsAtVhSeUFseziht227YAWYHLGNM8QPwY=
+sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.30.3/go.mod h1:Ve9uj1L+deCXFrPOk1LpFXqTg7LCFzFso6PA48q/XZw=
 sigs.k8s.io/structured-merge-diff/v4 v4.2.3/go.mod h1:qjx8mGObPmV2aSZepjQjbmb2ihdVs8cGKBraizNC69E=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
 sigs.k8s.io/yaml v1.3.0/go.mod h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8=

internal/ingress/controller/controller.go

@@ -108,6 +108,8 @@ type Configuration struct {
 	EnableMetrics        bool
 	MetricsPerHost       bool
 	MetricsBuckets       *collectors.HistogramBuckets
+	MetricsBucketFactor  float64
+	MetricsMaxBuckets    uint32
 	ReportStatusClasses  bool
 	ExcludeSocketMetrics []string
 

internal/ingress/metric/collectors/socket.go

@@ -99,7 +99,7 @@ var requestTags = []string{
 
 // NewSocketCollector creates a new SocketCollector instance using
 // the ingress watch namespace and class used by the controller
-func NewSocketCollector(pod, namespace, class string, metricsPerHost, reportStatusClasses bool, buckets HistogramBuckets, excludeMetrics []string) (*SocketCollector, error) {
+func NewSocketCollector(pod, namespace, class string, metricsPerHost, reportStatusClasses bool, buckets HistogramBuckets, bucketFactor float64, maxBuckets uint32, excludeMetrics []string) (*SocketCollector, error) {
 	socket := "/tmp/nginx/prometheus-nginx.socket"
 	// unix sockets must be unlink()ed before being used
 	//nolint:errcheck // Ignore unlink error
@@ -144,11 +144,13 @@ func NewSocketCollector(pod, namespace, class string, metricsPerHost, reportStat
 
 		connectTime: histogramMetric(
 			&prometheus.HistogramOpts{
-				Name:        "connect_duration_seconds",
+				Name:                           "connect_duration_seconds",
-				Help:        "The time spent on establishing a connection with the upstream server",
+				Help:                           "The time spent on establishing a connection with the upstream server",
-				Namespace:   PrometheusNamespace,
+				Namespace:                      PrometheusNamespace,
-				ConstLabels: constLabels,
+				ConstLabels:                    constLabels,
-				Buckets:     buckets.TimeBuckets,
+				Buckets:                        buckets.TimeBuckets,
+				NativeHistogramBucketFactor:    bucketFactor,
+				NativeHistogramMaxBucketNumber: maxBuckets,
 			},
 			requestTags,
 			em,
@@ -157,11 +159,13 @@ func NewSocketCollector(pod, namespace, class string, metricsPerHost, reportStat
 
 		headerTime: histogramMetric(
 			&prometheus.HistogramOpts{
-				Name:        "header_duration_seconds",
+				Name:                           "header_duration_seconds",
-				Help:        "The time spent on receiving first header from the upstream server",
+				Help:                           "The time spent on receiving first header from the upstream server",
-				Namespace:   PrometheusNamespace,
+				Namespace:                      PrometheusNamespace,
-				ConstLabels: constLabels,
+				ConstLabels:                    constLabels,
-				Buckets:     buckets.TimeBuckets,
+				Buckets:                        buckets.TimeBuckets,
+				NativeHistogramBucketFactor:    bucketFactor,
+				NativeHistogramMaxBucketNumber: maxBuckets,
 			},
 			requestTags,
 			em,
@@ -169,11 +173,13 @@ func NewSocketCollector(pod, namespace, class string, metricsPerHost, reportStat
 		),
 		responseTime: histogramMetric(
 			&prometheus.HistogramOpts{
-				Name:        "response_duration_seconds",
+				Name:                           "response_duration_seconds",
-				Help:        "The time spent on receiving the response from the upstream server",
+				Help:                           "The time spent on receiving the response from the upstream server",
-				Namespace:   PrometheusNamespace,
+				Namespace:                      PrometheusNamespace,
-				ConstLabels: constLabels,
+				ConstLabels:                    constLabels,
-				Buckets:     buckets.TimeBuckets,
+				Buckets:                        buckets.TimeBuckets,
+				NativeHistogramBucketFactor:    bucketFactor,
+				NativeHistogramMaxBucketNumber: maxBuckets,
 			},
 			requestTags,
 			em,
@@ -182,11 +188,13 @@ func NewSocketCollector(pod, namespace, class string, metricsPerHost, reportStat
 
 		requestTime: histogramMetric(
 			&prometheus.HistogramOpts{
-				Name:        "request_duration_seconds",
+				Name:                           "request_duration_seconds",
-				Help:        "The request processing time in milliseconds",
+				Help:                           "The request processing time in milliseconds",
-				Namespace:   PrometheusNamespace,
+				Namespace:                      PrometheusNamespace,
-				ConstLabels: constLabels,
+				ConstLabels:                    constLabels,
-				Buckets:     buckets.TimeBuckets,
+				Buckets:                        buckets.TimeBuckets,
+				NativeHistogramBucketFactor:    bucketFactor,
+				NativeHistogramMaxBucketNumber: maxBuckets,
 			},
 			requestTags,
 			em,
@@ -195,11 +203,13 @@ func NewSocketCollector(pod, namespace, class string, metricsPerHost, reportStat
 
 		responseLength: histogramMetric(
 			&prometheus.HistogramOpts{
-				Name:        "response_size",
+				Name:                           "response_size",
-				Help:        "The response length (including request line, header, and request body)",
+				Help:                           "The response length (including request line, header, and request body)",
-				Namespace:   PrometheusNamespace,
+				Namespace:                      PrometheusNamespace,
-				ConstLabels: constLabels,
+				ConstLabels:                    constLabels,
-				Buckets:     buckets.LengthBuckets,
+				Buckets:                        buckets.LengthBuckets,
+				NativeHistogramBucketFactor:    bucketFactor,
+				NativeHistogramMaxBucketNumber: maxBuckets,
 			},
 			requestTags,
 			em,
@@ -208,11 +218,13 @@ func NewSocketCollector(pod, namespace, class string, metricsPerHost, reportStat
 
 		requestLength: histogramMetric(
 			&prometheus.HistogramOpts{
-				Name:        "request_size",
+				Name:                           "request_size",
-				Help:        "The request length (including request line, header, and request body)",
+				Help:                           "The request length (including request line, header, and request body)",
-				Namespace:   PrometheusNamespace,
+				Namespace:                      PrometheusNamespace,
-				ConstLabels: constLabels,
+				ConstLabels:                    constLabels,
-				Buckets:     buckets.LengthBuckets,
+				Buckets:                        buckets.LengthBuckets,
+				NativeHistogramBucketFactor:    bucketFactor,
+				NativeHistogramMaxBucketNumber: maxBuckets,
 			},
 			requestTags,
 			em,

internal/ingress/metric/collectors/socket_test.go

@@ -83,6 +83,9 @@ func TestCollector(t *testing.T) {
 		prometheus.ExponentialBuckets(10, 10, 7),
 	}
 
+	bucketFactor := 1.1
+	maxBuckets := uint32(100)
+
 	cases := []struct {
 		name             string
 		data             []string
@@ -594,7 +597,7 @@ func TestCollector(t *testing.T) {
 		t.Run(c.name, func(t *testing.T) {
 			registry := prometheus.NewPedanticRegistry()
 
-			sc, err := NewSocketCollector("pod", "default", "ingress", true, c.useStatusClasses, buckets, c.excludeMetrics)
+			sc, err := NewSocketCollector("pod", "default", "ingress", true, c.useStatusClasses, buckets, bucketFactor, maxBuckets, c.excludeMetrics)
 			if err != nil {
 				t.Errorf("%v: unexpected error creating new SocketCollector: %v", c.name, err)
 			}

internal/ingress/metric/main.go

@@ -71,7 +71,7 @@ type collector struct {
 }
 
 // NewCollector creates a new metric collector the for ingress controller
-func NewCollector(metricsPerHost, reportStatusClasses bool, registry *prometheus.Registry, ingressclass string, buckets collectors.HistogramBuckets, excludedSocketMetrics []string) (Collector, error) {
+func NewCollector(metricsPerHost, reportStatusClasses bool, registry *prometheus.Registry, ingressclass string, buckets collectors.HistogramBuckets, bucketFactor float64, maxBuckets uint32, excludedSocketMetrics []string) (Collector, error) {
 	podNamespace := os.Getenv("POD_NAMESPACE")
 	if podNamespace == "" {
 		podNamespace = "default"
@@ -89,7 +89,7 @@ func NewCollector(metricsPerHost, reportStatusClasses bool, registry *prometheus
 		return nil, err
 	}
 
-	s, err := collectors.NewSocketCollector(podName, podNamespace, ingressclass, metricsPerHost, reportStatusClasses, buckets, excludedSocketMetrics)
+	s, err := collectors.NewSocketCollector(podName, podNamespace, ingressclass, metricsPerHost, reportStatusClasses, buckets, bucketFactor, maxBuckets, excludedSocketMetrics)
 	if err != nil {
 		return nil, err
 	}

pkg/flags/flags.go

@@ -183,6 +183,8 @@ Requires the update-status parameter.`)
 		timeBuckets          = flags.Float64Slice("time-buckets", prometheus.DefBuckets, "Set of buckets which will be used for prometheus histogram metrics such as RequestTime, ResponseTime.")
 		lengthBuckets        = flags.Float64Slice("length-buckets", prometheus.LinearBuckets(10, 10, 10), "Set of buckets which will be used for prometheus histogram metrics such as RequestLength, ResponseLength.")
 		sizeBuckets          = flags.Float64Slice("size-buckets", prometheus.ExponentialBuckets(10, 10, 7), "Set of buckets which will be used for prometheus histogram metrics such as BytesSent.")
+		bucketFactor         = flags.Float64("bucket-factor", 0, "Bucket factor for native histograms. Value must be > 1 for enabling native histograms.")
+		maxBuckets           = flags.Uint32("max-buckets", 100, "Maximum number of buckets for native histograms.")
 		excludeSocketMetrics = flags.StringSlice("exclude-socket-metrics", []string{}, "et of socket request metrics to exclude which won't be exported nor being calculated. E.g. 'nginx_ingress_controller_success,nginx_ingress_controller_header_duration_seconds'.")
 		monitorMaxBatchSize  = flags.Int("monitor-max-batch-size", 10000, "Max batch size of NGINX metrics.")
 
@@ -339,6 +341,8 @@ https://blog.maxmind.com/2019/12/18/significant-changes-to-accessing-and-using-g
 		EnableMetrics:               *enableMetrics,
 		MetricsPerHost:              *metricsPerHost,
 		MetricsBuckets:              histogramBuckets,
+		MetricsBucketFactor:         *bucketFactor,
+		MetricsMaxBuckets:           *maxBuckets,
 		ReportStatusClasses:         *reportStatusClasses,
 		ExcludeSocketMetrics:        *excludeSocketMetrics,
 		MonitorMaxBatchSize:         *monitorMaxBatchSize,