--- title: Resource Annotations description: Resource annotations used by Istio. location: https://istio.io/docs/reference/config/annotations.html weight: 29 ---

This page presents the various resource annotations that Istio supports to control its behavior.

Annotation Name | Description
--- | ---
`kubernetes.io/ingress.class` | Annotation on an Ingress resources denoting the class of controllers responsible for it.
`networking.istio.io/exportTo` | Specifies the namespaces to which this service should be exported to. A value of '*' indicates it is reachable within the mesh '.' indicates it is reachable within its namespace.
`policy.istio.io/check` | Determines the policy for behavior when unable to connect to Mixer. If not set, FAIL_CLOSE is set, rejecting requests.
`policy.istio.io/checkBaseRetryWaitTime` | Base time to wait between retries, will be adjusted by backoff and jitter. In duration format. If not set, this will be 80ms.
`policy.istio.io/checkMaxRetryWaitTime` | Maximum time to wait between retries to Mixer. In duration format. If not set, this will be 1000ms.
`policy.istio.io/checkRetries` | The maximum number of retries on transport errors to Mixer. If not set, this will be 0, indicating no retries.
`policy.istio.io/lang` | Selects the attribute expression langauge runtime for Mixer..
`readiness.status.sidecar.istio.io/applicationPorts` | Specifies the list of ports exposed by the application container. Used by the istio-proxy readiness probe to determine that Envoy is configured and ready to receive traffic.
`readiness.status.sidecar.istio.io/failureThreshold` | Specifies the failure threshold for the istio-proxy readiness probe.
`readiness.status.sidecar.istio.io/initialDelaySeconds` | Specifies the initial delay (in seconds) for the istio-proxy readiness probe.
`readiness.status.sidecar.istio.io/periodSeconds` | Specifies the period (in seconds) for the istio-proxy readiness probe.
`sidecar.istio.io/bootstrapOverride` | Specifies an alternative Envoy bootstrap configuration file.
`sidecar.istio.io/componentLogLevel` | Specifies the component log level for Envoy.
`sidecar.istio.io/controlPlaneAuthPolicy` | Specifies the auth policy used by the Istio control plane. If NONE, traffic will not be encrypted. If MUTUAL_TLS, traffic between istio-proxy sidecars will be wrapped into mutual TLS connections.
`sidecar.istio.io/discoveryAddress` | Specifies the XDS discovery address to be used by the istio-proxy sidecar.
`sidecar.istio.io/inject` | Specifies whether or not an istio-proxy sidecar should be automatically injected into the workload.
`sidecar.istio.io/interceptionMode` | Specifies the mode used to redirect inbound connections to Envoy (REDIRECT or TPROXY).
`sidecar.istio.io/logLevel` | Specifies the log level for Envoy.
`sidecar.istio.io/proxyCPU` | Specifies the requested CPU setting for the istio-proxy sidecar.
`sidecar.istio.io/proxyImage` | Specifies the Docker image to be used by the istio-proxy sidecar.
`sidecar.istio.io/proxyMemory` | Specifies the requested memory setting for the istio-proxy sidecar.
`sidecar.istio.io/rewriteAppHTTPProbers` | Rewrite HTTP readiness and liveness probes to be redirected to istio-proxy sidecar.
`sidecar.istio.io/statsInclusionPrefixes` | Specifies the comma separated list of prefixes of the stats to be emitted by Envoy.
`sidecar.istio.io/statsInclusionRegexps` | Specifies the comma separated list of regexes the stats should match to be emitted by Envoy.
`sidecar.istio.io/statsInclusionSuffixes` | Specifies the comma separated list of suffixes of the stats to be emitted by Envoy.
`sidecar.istio.io/status` | Generated by istio-proxy sidecar injection that indicates the status of the operation. Includes a version hash of the executed template, as well as names of injected resources.
`sidecar.istio.io/userVolume` | Specifies one or more user volumes (as a JSON array) to be added to the istio-proxy sidecar.
`sidecar.istio.io/userVolumeMount` | Specifies one or more user volume mounts (as a JSON array) to be added to the istio-proxy sidecar.
`status.sidecar.istio.io/port` | Specifies the HTTP status Port for the istio-proxy sidecar. If zero, the istio-proxy will not provide status.
`traffic.sidecar.istio.io/excludeInboundPorts` | A comma separated list of inbound ports to be excluded from redirection to Envoy. Only applies when all inbound traffic (i.e. '*') is being redirected.
`traffic.sidecar.istio.io/excludeOutboundIPRanges` | A comma separated list of IP ranges in CIDR form to be excluded from redirection. Only applies when all outbound traffic (i.e. '*') is being redirected.
`traffic.sidecar.istio.io/excludeOutboundPorts` | A comma separated list of outbound ports to be excluded from redirection to Envoy.
`traffic.sidecar.istio.io/includeInboundPorts` | A comma separated list of inbound ports for which traffic is to be redirected to Envoy. The wildcard character '*' can be used to configure redirection for all ports. An empty list will disable all inbound redirection.
`traffic.sidecar.istio.io/includeOutboundIPRanges` | A comma separated list of IP ranges in CIDR form to redirect to envoy (optional). The wildcard character '*' can be used to redirect all outbound traffic. An empty list will disable all outbound redirection.
`traffic.sidecar.istio.io/kubevirtInterfaces` | A comma separated list of virtual interfaces whose inbound traffic (from VM) will be treated as outbound.