Fix metrics bucket key high cardinality
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@ -438,3 +438,11 @@ To enable HTTP/3 on an EntryPoint, please check out the [HTTP/3 configuration](.
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In `v2.6`, the [Kubernetes Gateway API provider](../providers/kubernetes-gateway.md) now only supports the version [v1alpha2](https://gateway-api.sigs.k8s.io/v1alpha2/guides/getting-started/) of the specification and
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[route namespaces](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.RouteNamespaces) selectors, which requires Traefik to fetch and watch the cluster namespaces.
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Therefore, the [RBAC](../reference/dynamic-configuration/kubernetes-gateway.md#rbac) and [CRD](../reference/dynamic-configuration/kubernetes-gateway.md#definitions) definitions must be updated.
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## v2.6.0 to v2.6.1
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In `v2.6.1`, the metrics system does not support any more custom HTTP method verbs to prevent potential metrics cardinality overhead.
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In consequence, for metrics having the method label,
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if the HTTP method verb of a request is not one defined in the set of common methods for [`HTTP/1.1`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods)
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or the [`PRI`](https://datatracker.ietf.org/doc/html/rfc7540#section-11.6) verb (for `HTTP/2`),
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the value for the method label becomes `EXTENSION_METHOD`, instead of the request's one.
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@ -61,7 +61,7 @@ traefik_config_last_reload_success
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The expiration date of certificates.
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Available labels: `cn`, `sans`, `serial`.
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[Labels](#labels): `cn`, `sans`, `serial`.
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```dd tab="Datadog"
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tls.certs.notAfterTimestamp
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@ -93,7 +93,7 @@ traefik_tls_certs_not_after
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The total count of HTTP requests received by an entrypoint.
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Available labels: `code`, `method`, `protocol`, `entrypoint`.
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[Labels](#labels): `code`, `method`, `protocol`, `entrypoint`.
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```dd tab="Datadog"
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entrypoint.request.total
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@ -116,7 +116,7 @@ traefik_entrypoint_requests_total
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The total count of HTTPS requests received by an entrypoint.
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Available labels: `tls_version`, `tls_cipher`, `entrypoint`.
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[Labels](#labels): `tls_version`, `tls_cipher`, `entrypoint`.
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```dd tab="Datadog"
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entrypoint.request.tls.total
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@ -139,7 +139,7 @@ traefik_entrypoint_requests_tls_total
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Request processing duration histogram on an entrypoint.
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Available labels: `code`, `method`, `protocol`, `entrypoint`.
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[Labels](#labels): `code`, `method`, `protocol`, `entrypoint`.
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```dd tab="Datadog"
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entrypoint.request.duration
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@ -162,7 +162,7 @@ traefik_entrypoint_request_duration_seconds
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The current count of open connections on an entrypoint.
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Available labels: `method`, `protocol`, `entrypoint`.
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[Labels](#labels): `method`, `protocol`, `entrypoint`.
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```dd tab="Datadog"
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entrypoint.connections.open
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@ -194,7 +194,7 @@ traefik_entrypoint_open_connections
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The total count of HTTP requests handled by a router.
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Available labels: `code`, `method`, `protocol`, `router`, `service`.
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[Labels](#labels): `code`, `method`, `protocol`, `router`, `service`.
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```dd tab="Datadog"
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router.request.total
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@ -217,7 +217,7 @@ traefik_router_requests_total
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The total count of HTTPS requests handled by a router.
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Available labels: `tls_version`, `tls_cipher`, `router`, `service`.
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[Labels](#labels): `tls_version`, `tls_cipher`, `router`, `service`.
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```dd tab="Datadog"
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router.request.tls.total
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@ -240,7 +240,7 @@ traefik_router_requests_tls_total
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Request processing duration histogram on a router.
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Available labels: `code`, `method`, `protocol`, `router`, `service`.
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[Labels](#labels): `code`, `method`, `protocol`, `router`, `service`.
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```dd tab="Datadog"
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router.request.duration
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@ -263,7 +263,7 @@ traefik_router_request_duration_seconds
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The current count of open connections on a router.
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Available labels: `method`, `protocol`, `router`, `service`.
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[Labels](#labels): `method`, `protocol`, `router`, `service`.
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```dd tab="Datadog"
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router.connections.open
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@ -297,7 +297,7 @@ traefik_router_open_connections
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The total count of HTTP requests processed on a service.
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Available labels: `code`, `method`, `protocol`, `service`.
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[Labels](#labels): `code`, `method`, `protocol`, `service`.
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```dd tab="Datadog"
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service.request.total
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@ -320,7 +320,7 @@ traefik_service_requests_total
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The total count of HTTPS requests processed on a service.
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Available labels: `tls_version`, `tls_cipher`, `service`.
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[Labels](#labels): `tls_version`, `tls_cipher`, `service`.
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```dd tab="Datadog"
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router.service.tls.total
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@ -343,7 +343,7 @@ traefik_service_requests_tls_total
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Request processing duration histogram on a service.
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Available labels: `code`, `method`, `protocol`, `service`.
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[Labels](#labels): `code`, `method`, `protocol`, `service`.
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```dd tab="Datadog"
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service.request.duration
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@ -366,7 +366,7 @@ traefik_service_request_duration_seconds
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The current count of open connections on a service.
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Available labels: `method`, `protocol`, `service`.
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[Labels](#labels): `method`, `protocol`, `service`.
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```dd tab="Datadog"
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service.connections.open
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@ -389,7 +389,7 @@ traefik_service_open_connections
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The count of requests retries on a service.
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Available labels: `service`.
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[Labels](#labels): `service`.
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```dd tab="Datadog"
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service.retries.total
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@ -412,7 +412,7 @@ traefik_service_retries_total
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Current service's server status, described by a gauge with a value of 0 for a down server or a value of 1 for an up server.
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Available labels: `service`, `url`.
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[Labels](#labels): `service`, `url`.
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```dd tab="Datadog"
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service.server.up
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@ -430,3 +430,28 @@ traefik_service_server_up
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# Default prefix: "traefik"
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{prefix}.service.server.up
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```
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## Labels
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Here is a comprehensive list of labels that are provided by the metrics:
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| Label | Description | example |
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|---------------|---------------------------------------|----------------------------|
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| `cn` | Certificate Common Name | "example.com" |
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| `code` | Request code | "200" |
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| `entrypoint` | Entrypoint that handled the request | "example_entrypoint" |
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| `method` | Request Method | "GET" |
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| `protocol` | Request protocol | "http" |
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| `router` | Router that handled the request | "example_router" |
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| `sans` | Certificate Subject Alternative NameS | "example.com" |
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| `serial` | Certificate Serial Number | "123..." |
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| `service` | Service that handled the request | "example_service@provider" |
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| `tls_cipher` | TLS cipher used for the request | "TLS_FALLBACK_SCSV" |
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| `tls_version` | TLS version used for the request | "1.0" |
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| `url` | Service server url | "http://example.com" |
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!!! info "`method` label value"
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If the HTTP method verb on a request is not one defined in the set of common methods for [`HTTP/1.1`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods)
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or the [`PRI`](https://datatracker.ietf.org/doc/html/rfc7540#section-11.6) verb (for `HTTP/2`),
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then the value for the method label becomes `EXTENSION_METHOD`.
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@ -159,12 +159,27 @@ func containsHeader(req *http.Request, name, value string) bool {
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return false
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}
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// getMethod returns the request's method.
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// It checks whether the method is a valid UTF-8 string.
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// To restrict the (potentially infinite) number of accepted values for the method,
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// and avoid unbounded memory issues,
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// values that are not part of the set of HTTP verbs are replaced with EXTENSION_METHOD.
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// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods
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// https://datatracker.ietf.org/doc/html/rfc2616/#section-5.1.1.
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func getMethod(r *http.Request) string {
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if !utf8.ValidString(r.Method) {
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log.Warnf("Invalid HTTP method encoding: %s", r.Method)
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log.WithoutContext().Warnf("Invalid HTTP method encoding: %s", r.Method)
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return "NON_UTF8_HTTP_METHOD"
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}
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switch r.Method {
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case "HEAD", "GET", "POST", "PUT", "DELETE", "CONNECT", "OPTIONS", "TRACE", // https://datatracker.ietf.org/doc/html/rfc7231#section-4
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"PATCH", // https://datatracker.ietf.org/doc/html/rfc5789#section-2
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"PRI": // https://datatracker.ietf.org/doc/html/rfc7540#section-11.6
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return r.Method
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default:
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return "EXTENSION_METHOD"
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}
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}
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type retryMetrics interface {
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@ -4,6 +4,7 @@ import (
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"net/http"
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"net/http/httptest"
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"reflect"
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"strings"
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"testing"
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"github.com/go-kit/kit/metrics"
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@ -98,3 +99,33 @@ func TestCloseNotifier(t *testing.T) {
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})
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}
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}
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func Test_getMethod(t *testing.T) {
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testCases := []struct {
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method string
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expected string
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}{
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{
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method: http.MethodGet,
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expected: http.MethodGet,
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},
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{
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method: strings.ToLower(http.MethodGet),
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expected: "EXTENSION_METHOD",
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},
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{
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method: "THIS_IS_NOT_A_VALID_METHOD",
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expected: "EXTENSION_METHOD",
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},
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}
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for _, test := range testCases {
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test := test
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t.Run(test.method, func(t *testing.T) {
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t.Parallel()
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request := httptest.NewRequest(test.method, "http://example.com", nil)
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assert.Equal(t, test.expected, getMethod(request))
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})
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}
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}
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