operator

22 minute read

The Istio operator.

Flags	Description
`--kubeconfig <string>`	Paths to a kubeconfig. Only required if out-of-cluster. (default ``)
`--vklog <Level>`	number for the log level verbosity. Like -v flag. ex: --vklog=9 (default `0`)

operator completion

Generate the autocompletion script for operator for the specified shell. See each sub-command's help for details on how to use the generated script.

Flags	Description
`--kubeconfig <string>`	Paths to a kubeconfig. Only required if out-of-cluster. (default ``)
`--vklog <Level>`	number for the log level verbosity. Like -v flag. ex: --vklog=9 (default `0`)

operator completion bash

Generate the autocompletion script for the bash shell.

This script depends on the 'bash-completion' package. If it is not installed already, you can install it via your OS's package manager.

To load completions in your current shell session:

source <(operator completion bash)

To load completions for every new session, execute once:

#### Linux:

operator completion bash > /etc/bash_completion.d/operator

#### macOS:

operator completion bash > $(brew --prefix)/etc/bash_completion.d/operator

You will need to start a new shell for this setup to take effect.

operator completion bash

Flags	Description
`--kubeconfig <string>`	Paths to a kubeconfig. Only required if out-of-cluster. (default ``)
`--no-descriptions`	disable completion descriptions
`--vklog <Level>`	number for the log level verbosity. Like -v flag. ex: --vklog=9 (default `0`)

operator completion fish

Generate the autocompletion script for the fish shell.

To load completions in your current shell session:

operator completion fish | source

To load completions for every new session, execute once:

operator completion fish > ~/.config/fish/completions/operator.fish

You will need to start a new shell for this setup to take effect.

operator completion fish [flags]

Flags	Description
`--kubeconfig <string>`	Paths to a kubeconfig. Only required if out-of-cluster. (default ``)
`--no-descriptions`	disable completion descriptions
`--vklog <Level>`	number for the log level verbosity. Like -v flag. ex: --vklog=9 (default `0`)

operator completion powershell

Generate the autocompletion script for powershell.

To load completions in your current shell session:

operator completion powershell | Out-String | Invoke-Expression

To load completions for every new session, add the output of the above command to your powershell profile.

operator completion powershell [flags]

Flags	Description
`--kubeconfig <string>`	Paths to a kubeconfig. Only required if out-of-cluster. (default ``)
`--no-descriptions`	disable completion descriptions
`--vklog <Level>`	number for the log level verbosity. Like -v flag. ex: --vklog=9 (default `0`)

operator completion zsh

Generate the autocompletion script for the zsh shell.

If shell completion is not already enabled in your environment you will need to enable it. You can execute the following once:

echo "autoload -U compinit; compinit" >> ~/.zshrc

To load completions in your current shell session:

source <(operator completion zsh); compdef _operator operator

To load completions for every new session, execute once:

#### Linux:

operator completion zsh > "${fpath[1]}/_operator"

#### macOS:

operator completion zsh > $(brew --prefix)/share/zsh/site-functions/_operator

You will need to start a new shell for this setup to take effect.

operator completion zsh [flags]

Flags	Description
`--kubeconfig <string>`	Paths to a kubeconfig. Only required if out-of-cluster. (default ``)
`--no-descriptions`	disable completion descriptions
`--vklog <Level>`	number for the log level verbosity. Like -v flag. ex: --vklog=9 (default `0`)

operator server

Starts the Istio operator server

operator server [flags]

Flags	Description
`--ctrlz_address <string>`	The IP Address to listen on for the ControlZ introspection facility. Use '*' to indicate all addresses. (default `localhost`)
`--ctrlz_port <uint16>`	The IP port to use for the ControlZ introspection facility (default `9876`)
`--force`	Proceed even with validation errors.
`--kubeconfig <string>`	Paths to a kubeconfig. Only required if out-of-cluster. (default ``)
`--log_as_json`	Whether to format output as JSON or in plain console-friendly format
`--log_caller <string>`	Comma-separated list of scopes for which to include caller information, scopes can be any of [ads, adsc, all, analysis, authn, authorization, ca, controllers, default, delta, file, gateway, grpcgen, installer, klog, kube, model, patch, processing, proxyconfig, retry, security, serviceentry, spiffe, status, telemetry, tpath, translator, trustBundle, util, validation, wasm, wle] (default ``)
`--log_output_level <string>`	Comma-separated minimum per-scope logging level of messages to output, in the form of <scope>:<level>,<scope>:<level>,... where scope can be one of [ads, adsc, all, analysis, authn, authorization, ca, controllers, default, delta, file, gateway, grpcgen, installer, klog, kube, model, patch, processing, proxyconfig, retry, security, serviceentry, spiffe, status, telemetry, tpath, translator, trustBundle, util, validation, wasm, wle] and level can be one of [debug, info, warn, error, fatal, none] (default `default:info`)
`--log_rotate <string>`	The path for the optional rotating log file (default ``)
`--log_rotate_max_age <int>`	The maximum age in days of a log file beyond which the file is rotated (0 indicates no limit) (default `30`)
`--log_rotate_max_backups <int>`	The maximum number of log file backups to keep before older files are deleted (0 indicates no limit) (default `1000`)
`--log_rotate_max_size <int>`	The maximum size in megabytes of a log file beyond which the file is rotated (default `104857600`)
`--log_stacktrace_level <string>`	Comma-separated minimum per-scope logging level at which stack traces are captured, in the form of <scope>:<level>,<scope:level>,... where scope can be one of [ads, adsc, all, analysis, authn, authorization, ca, controllers, default, delta, file, gateway, grpcgen, installer, klog, kube, model, patch, processing, proxyconfig, retry, security, serviceentry, spiffe, status, telemetry, tpath, translator, trustBundle, util, validation, wasm, wle] and level can be one of [debug, info, warn, error, fatal, none] (default `default:none`)
`--log_target <stringArray>`	The set of paths where to output the log. This can be any path as well as the special values stdout and stderr (default `[stdout]`)
`--vklog <Level>`	number for the log level verbosity. Like -v flag. ex: --vklog=9 (default `0`)

operator version

Prints out build version information

operator version [flags]

Flags	Shorthand	Description
`--kubeconfig <string>`		Paths to a kubeconfig. Only required if out-of-cluster. (default ``)
`--output <string>`	`-o`	One of 'yaml' or 'json'. (default ``)
`--short`	`-s`	Use --short=false to generate full version information
`--vklog <Level>`		number for the log level verbosity. Like -v flag. ex: --vklog=9 (default `0`)

Environment variables

These environment variables affect the behavior of the operator command. Please use with caution as these environment variables are experimental and can change anytime.

Variable Name	Type	Default Value	Description
`AUTO_RELOAD_PLUGIN_CERTS`	Boolean	`false`	If enabled, if user introduces new intermediate plug-in CA, user need not to restart istiod to pick up certs.Istiod picks newly added intermediate plug-in CA certs and updates it. Plug-in new Root-CA not supported.
`CERT_SIGNER_DOMAIN`	String		The cert signer domain info
`CLOUD_PLATFORM`	String		Cloud Platform on which proxy is running, if not specified, Istio will try to discover the platform. Valid platform values are aws, azure, gcp, none
`CLUSTER_ID`	String	`Kubernetes`	Defines the cluster and service registry that this Istiod instance is belongs to
`ENABLE_AUTO_MTLS_CHECK_POLICIES`	Boolean	`true`	Enable the auto mTLS EDS output to consult the PeerAuthentication Policy, only set the {tlsMode: istio} when server side policy enables mTLS PERMISSIVE or STRICT.
`ENABLE_AUTO_SNI`	Boolean	`false`	If enabled, automatically set SNI when `DestinationRules` do not specify the same
`ENABLE_CA_SERVER`	Boolean	`true`	If this is set to false, will not create CA server in istiod.
`ENABLE_DEBUG_ON_HTTP`	Boolean	`true`	If this is set to false, the debug interface will not be enabled, recommended for production
`ENABLE_HCM_INTERNAL_NETWORKS`	Boolean	`false`	If enable, endpoints defined in mesh networks will be configured as internal addresses in Http Connection Manager
`ENABLE_LEGACY_FSGROUP_INJECTION`	Boolean	`false`	If true, Istiod will set the pod fsGroup to 1337 on injection. This is required for Kubernetes 1.18 and older (see https://github.com/kubernetes/kubernetes/issues/57923 for details) unless JWT_POLICY is "first-party-jwt".
`ENABLE_LEGACY_LB_ALGORITHM_DEFAULT`	Boolean	`false`	If enabled, destinations for which no LB algorithm is specified will use the legacy default, ROUND_ROBIN. Care should be taken when using ROUND_ROBIN in general as it can overburden endpoints, especially when weights are used.
`ENABLE_MCS_AUTO_EXPORT`	Boolean	`false`	If enabled, istiod will automatically generate Kubernetes Multi-Cluster Services (MCS) ServiceExport resources for every service in the mesh. Services defined to be cluster-local in MeshConfig are excluded.
`ENABLE_MCS_CLUSTER_LOCAL`	Boolean	`false`	If enabled, istiod will treat the host `<svc>.<namespace>.svc.cluster.local` as defined by the Kubernetes Multi-Cluster Services (MCS) spec. In this mode, requests to `cluster.local` will be routed to only those endpoints residing within the same cluster as the client. Requires that both ENABLE_MCS_SERVICE_DISCOVERY and ENABLE_MCS_HOST also be enabled.
`ENABLE_MCS_HOST`	Boolean	`false`	If enabled, istiod will configure a Kubernetes Multi-Cluster Services (MCS) host (<svc>.<namespace>.svc.clusterset.local) for each service exported (via ServiceExport) in at least one cluster. Clients must, however, be able to successfully lookup these DNS hosts. That means that either Istio DNS interception must be enabled or an MCS controller must be used. Requires that ENABLE_MCS_SERVICE_DISCOVERY also be enabled.
`ENABLE_MCS_SERVICE_DISCOVERY`	Boolean	`false`	If enabled, istiod will enable Kubernetes Multi-Cluster Services (MCS) service discovery mode. In this mode, service endpoints in a cluster will only be discoverable within the same cluster unless explicitly exported via ServiceExport.
`ENABLE_MULTICLUSTER_HEADLESS`	Boolean	`true`	If true, the DNS name table for a headless service will resolve to same-network endpoints in any cluster.
`ENABLE_PROBE_KEEPALIVE_CONNECTIONS`	Boolean	`false`	If enabled, readiness probes will keep the connection from pilot-agent to the application alive. This mirrors older Istio versions' behaviors, but not kubelet's.
`ENABLE_TLS_ON_SIDECAR_INGRESS`	Boolean	`false`	If enabled, the TLS configuration on Sidecar.ingress will take effect
`ENABLE_WASM_TELEMETRY`	Boolean	`false`	If enabled, Wasm-based telemetry will be enabled.
`EXTERNAL_ISTIOD`	Boolean	`false`	If this is set to true, one Istiod will control remote clusters including CA.
`GCP_METADATA`	String		Pipe separated GCP metadata, schemed as PROJECT_ID\|PROJECT_NUMBER\|CLUSTER_NAME\|CLUSTER_ZONE
`GCP_QUOTA_PROJECT`	String		Allows specification of a quota project to be used in requests to GCP APIs.
`HTTP_STRIP_FRAGMENT_FROM_PATH_UNSAFE_IF_DISABLED`	Boolean	`true`
`INJECTION_WEBHOOK_CONFIG_NAME`	String	`istio-sidecar-injector`	Name of the mutatingwebhookconfiguration to patch, if istioctl is not used.
`ISTIOD_CUSTOM_HOST`	String		Custom host name of istiod that istiod signs the server cert. Multiple custom host names are supported, and multiple values are separated by commas.
`ISTIO_AGENT_ENABLE_WASM_REMOTE_LOAD_CONVERSION`	Boolean	`true`	If enabled, Istio agent will intercept ECDS resource update, downloads Wasm module, and replaces Wasm module remote load with downloaded local module file.
`ISTIO_BOOTSTRAP`	String
`ISTIO_DEFAULT_REQUEST_TIMEOUT`	Time Duration	`0s`	Default Http and gRPC Request timeout
`ISTIO_DELTA_XDS`	Boolean	`false`	If enabled, pilot will only send the delta configs as opposed to the state of the world on a Resource Request. This feature uses the delta xds api, but does not currently send the actual deltas.
`ISTIO_ENABLE_HTTP2_PROBING`	Boolean	`true`	If enabled, HTTP2 probes will be enabled for HTTPS probes, following Kubernetes
`ISTIO_GATEWAY_STRIP_HOST_PORT`	Boolean	`false`	If enabled, Gateway will remove any port from host/authority header before any processing of request by HTTP filters or routing. Deprecated: in Istio 1.15+ port is ignored in domain matching.
`ISTIO_GPRC_MAXRECVMSGSIZE`	Integer	`4194304`	Sets the max receive buffer size of gRPC stream in bytes.
`ISTIO_GPRC_MAXSTREAMS`	Integer	`100000`	Sets the maximum number of concurrent grpc streams.
`ISTIO_MULTIROOT_MESH`	Boolean	`false`	If enabled, mesh will support certificates signed by more than one trustAnchor for ISTIO_MUTUAL mTLS
`ISTIO_PROMETHEUS_ANNOTATIONS`	String
`JWT_POLICY`	String	`third-party-jwt`	The JWT validation policy.
`K8S_INGRESS_NS`	String
`K_REVISION`	String		KNative revision, set if running in knative
`LABEL_CANONICAL_SERVICES_FOR_MESH_EXTERNAL_SERVICE_ENTRIES`	Boolean	`false`	If enabled, metadata representing canonical services for ServiceEntry resources with a location of mesh_external will be populatedin the cluster metadata for those endpoints.
`LOCAL_CLUSTER_SECRET_WATCHER`	Boolean	`false`	If enabled, the cluster secret watcher will watch the namespace of the external cluster instead of config cluster
`MCS_API_GROUP`	String	`multicluster.x-k8s.io`	The group to be used for the Kubernetes Multi-Cluster Services (MCS) API.
`MCS_API_VERSION`	String	`v1alpha1`	The version to be used for the Kubernets Multi-Cluster Services (MCS) API.
`PILOT_ANALYSIS_INTERVAL`	Time Duration	`10s`	If analysis is enabled, pilot will run istio analyzers using this value as interval in seconds Istio Resources
`PILOT_CERT_PROVIDER`	String	`istiod`	The provider of Pilot DNS certificate.
`PILOT_DEBOUNCE_AFTER`	Time Duration	`100ms`	The delay added to config/registry events for debouncing. This will delay the push by at least this interval. If no change is detected within this period, the push will happen, otherwise we'll keep delaying until things settle, up to a max of PILOT_DEBOUNCE_MAX.
`PILOT_DEBOUNCE_MAX`	Time Duration	`10s`	The maximum amount of time to wait for events while debouncing. If events keep showing up with no breaks for this time, we'll trigger a push.
`PILOT_DISTRIBUTION_HISTORY_RETENTION`	Time Duration	`1m0s`	If enabled, Pilot will keep track of old versions of distributed config for this duration.
`PILOT_ENABLE_ALPN_FILTER`	Boolean	`true`	If true, pilot will add Istio ALPN filters, required for proper protocol sniffing.
`PILOT_ENABLE_ANALYSIS`	Boolean	`false`	If enabled, pilot will run istio analyzers and write analysis errors to the Status field of any Istio Resources
`PILOT_ENABLE_CDS_CACHE`	Boolean	`true`	If true, Pilot will cache CDS responses. Note: this depends on PILOT_ENABLE_XDS_CACHE.
`PILOT_ENABLE_CONFIG_DISTRIBUTION_TRACKING`	Boolean	`true`	If enabled, Pilot will assign meaningful nonces to each Envoy configuration message, and allow users to interrogate which envoy has which config from the debug interface.
`PILOT_ENABLE_CROSS_CLUSTER_WORKLOAD_ENTRY`	Boolean	`true`	If enabled, pilot will read WorkloadEntry from other clusters, selectable by Services in that cluster.
`PILOT_ENABLE_DESTINATION_RULE_INHERITANCE`	Boolean	`false`	If set, workload specific DestinationRules will inherit configurations settings from mesh and namespace level rules
`PILOT_ENABLE_EDS_DEBOUNCE`	Boolean	`true`	If enabled, Pilot will include EDS pushes in the push debouncing, configured by PILOT_DEBOUNCE_AFTER and PILOT_DEBOUNCE_MAX. EDS pushes may be delayed, but there will be fewer pushes. By default this is enabled
`PILOT_ENABLE_EDS_FOR_HEADLESS_SERVICES`	Boolean	`false`	If enabled, for headless service in Kubernetes, pilot will send endpoints over EDS, allowing the sidecar to load balance among pods in the headless service. This feature should be enabled if applications access all services explicitly via a HTTP proxy port in the sidecar.
`PILOT_ENABLE_GATEWAY_API`	Boolean	`true`	If this is set to true, support for Kubernetes gateway-api (github.com/kubernetes-sigs/gateway-api) will be enabled. In addition to this being enabled, the gateway-api CRDs need to be installed.
`PILOT_ENABLE_GATEWAY_API_DEPLOYMENT_CONTROLLER`	Boolean	`true`	If this is set to true, gateway-api resources will automatically provision in cluster deployment, services, etc
`PILOT_ENABLE_GATEWAY_API_STATUS`	Boolean	`true`	If this is set to true, gateway-api resources will have status written to them
`PILOT_ENABLE_HEADLESS_SERVICE_POD_LISTENERS`	Boolean	`true`	If enabled, for a headless service/stateful set in Kubernetes, pilot will generate an outbound listener for each pod in a headless service. This feature should be disabled if headless services have a large number of pods.
`PILOT_ENABLE_INBOUND_PASSTHROUGH`	Boolean	`true`	If enabled, inbound clusters will be configured as ORIGINAL_DST clusters. When disabled, requests are always sent to localhost. The primary implication of this is that when enabled, binding to POD_IP will work while localhost will not; when disable, bind to POD_IP will not work, while localhost will. The enabled behavior matches the behavior without Istio enabled at all; this flag exists only for backwards compatibility. Regardless of this setting, the configuration can be overridden with the Sidecar.Ingress.DefaultEndpoint configuration.
`PILOT_ENABLE_ISTIO_TAGS`	Boolean	`true`	Determines whether or not trace spans generated by Envoy will include Istio-specific tags.
`PILOT_ENABLE_K8S_SELECT_WORKLOAD_ENTRIES`	Boolean	`true`	If enabled, Kubernetes services with selectors will select workload entries with matching labels. It is safe to disable it if you are quite sure you don't need this feature
`PILOT_ENABLE_LEGACY_AUTO_PASSTHROUGH`	Boolean	`false`	If enabled, pilot will allow any upstream cluster to be used with AUTO_PASSTHROUGH. This option is intended for backwards compatibility only and is not secure with untrusted downstreams; it will be removed in the future.
`PILOT_ENABLE_LEGACY_ISTIO_MUTUAL_CREDENTIAL_NAME`	Boolean	`false`	If enabled, Gateway's with ISTIO_MUTUAL mode and credentialName configured will use simple TLS. This is to retain legacy behavior only and not recommended for use beyond migration.
`PILOT_ENABLE_METADATA_EXCHANGE`	Boolean	`true`	If true, pilot will add metadata exchange filters, which will be consumed by telemetry filter.
`PILOT_ENABLE_MONGO_FILTER`	Boolean	`true`	EnableMongoFilter enables injection of `envoy.filters.network.mongo_proxy` in the filter chain.
`PILOT_ENABLE_MYSQL_FILTER`	Boolean	`false`	EnableMysqlFilter enables injection of `envoy.filters.network.mysql_proxy` in the filter chain.
`PILOT_ENABLE_PROTOCOL_SNIFFING_FOR_INBOUND`	Boolean	`true`	If enabled, protocol sniffing will be used for inbound listeners whose port protocol is not specified or unsupported
`PILOT_ENABLE_PROTOCOL_SNIFFING_FOR_OUTBOUND`	Boolean	`true`	If enabled, protocol sniffing will be used for outbound listeners whose port protocol is not specified or unsupported
`PILOT_ENABLE_QUIC_LISTENERS`	Boolean	`false`	If true, QUIC listeners will be generated wherever there are listeners terminating TLS on gateways if the gateway service exposes a UDP port with the same number (for example 443/TCP and 443/UDP)
`PILOT_ENABLE_RDS_CACHE`	Boolean	`true`	If true, Pilot will cache RDS responses. Note: this depends on PILOT_ENABLE_XDS_CACHE.
`PILOT_ENABLE_REDIS_FILTER`	Boolean	`false`	EnableRedisFilter enables injection of `envoy.filters.network.redis_proxy` in the filter chain.
`PILOT_ENABLE_ROUTE_COLLAPSE_OPTIMIZATION`	Boolean	`true`	If true, Pilot will merge virtual hosts with the same routes into a single virtual host, as an optimization.
`PILOT_ENABLE_SERVICEENTRY_SELECT_PODS`	Boolean	`true`	If enabled, service entries with selectors will select pods from the cluster. It is safe to disable it if you are quite sure you don't need this feature
`PILOT_ENABLE_STATUS`	Boolean	`false`	If enabled, pilot will update the CRD Status field of all istio resources with reconciliation status.
`PILOT_ENABLE_TELEMETRY_LABEL`	Boolean	`true`	If true, pilot will add telemetry related metadata to cluster and endpoint resources, which will be consumed by telemetry filter.
`PILOT_ENABLE_WORKLOAD_ENTRY_AUTOREGISTRATION`	Boolean	`true`	Enables auto-registering WorkloadEntries based on associated WorkloadGroups upon XDS connection by the workload.
`PILOT_ENABLE_WORKLOAD_ENTRY_HEALTHCHECKS`	Boolean	`true`	Enables automatic health checks of WorkloadEntries based on the config provided in the associated WorkloadGroup
`PILOT_ENABLE_XDS_CACHE`	Boolean	`true`	If true, Pilot will cache XDS responses.
`PILOT_ENABLE_XDS_IDENTITY_CHECK`	Boolean	`true`	If enabled, pilot will authorize XDS clients, to ensure they are acting only as namespaces they have permissions for.
`PILOT_ENDPOINT_TELEMETRY_LABEL`	Boolean	`true`	If true, pilot will add telemetry related metadata to Endpoint resource, which will be consumed by telemetry filter.
`PILOT_ENVOY_FILTER_STATS`	Boolean	`false`	If true, Pilot will collect metrics for envoy filter operations.
`PILOT_FILTER_GATEWAY_CLUSTER_CONFIG`	Boolean	`false`	If enabled, Pilot will send only clusters that referenced in gateway virtual services attached to gateway
`PILOT_HTTP10`	Boolean	`false`	Enables the use of HTTP 1.0 in the outbound HTTP listeners, to support legacy applications.
`PILOT_INBOUND_PROTOCOL_DETECTION_TIMEOUT`	Time Duration	`1s`	Protocol detection timeout for inbound listener
`PILOT_INSECURE_MULTICLUSTER_KUBECONFIG_OPTIONS`	String		Comma separated list of potentially insecure kubeconfig authentication options that are allowed for multicluster authentication.Support values: all authProviders (`gcp`, `azure`, `exec`, `openstack`), `clientKey`, `clientCertificate`, `tokenFile`, and `exec`.
`PILOT_JWT_ENABLE_REMOTE_JWKS`	Boolean	`false`	If enabled, checks to see if the configured JwksUri in RequestAuthentication is a mesh cluster URL and configures remote Jwks to let Envoy fetch the Jwks instead of Istiod.
`PILOT_JWT_PUB_KEY_REFRESH_INTERVAL`	Time Duration	`20m0s`	The interval for istiod to fetch the jwks_uri for the jwks public key.
`PILOT_LEGACY_INGRESS_BEHAVIOR`	Boolean	`false`	If this is set to true, istio ingress will perform the legacy behavior, which does not meet https://kubernetes.io/docs/concepts/services-networking/ingress/#multiple-matches.
`PILOT_MAX_REQUESTS_PER_SECOND`	Floating-Point	`25`	Limits the number of incoming XDS requests per second. On larger machines this can be increased to handle more proxies concurrently.
`PILOT_PARTIAL_FULL_PUSHES`	Boolean	`true`	If enabled, pilot will send partial pushes in for child resources (RDS, EDS, etc) when possible. This occurs for EDS in many cases regardless of this setting.
`PILOT_PUSH_THROTTLE`	Integer	`100`	Limits the number of concurrent pushes allowed. On larger machines this can be increased for faster pushes
`PILOT_REMOTE_CLUSTER_TIMEOUT`	Time Duration	`30s`	After this timeout expires, pilot can become ready without syncing data from clusters added via remote-secrets. Setting the timeout to 0 disables this behavior.
`PILOT_SCOPE_GATEWAY_TO_NAMESPACE`	Boolean	`false`	If enabled, a gateway workload can only select gateway resources in the same namespace. Gateways with same selectors in different namespaces will not be applicable.
`PILOT_SEND_UNHEALTHY_ENDPOINTS`	Boolean	`false`	If enabled, Pilot will include unhealthy endpoints in EDS pushes and even if they are sent Envoy does not use them for load balancing. To avoid, sending traffic to non ready endpoints, enabling this flag, disables panic threshold in Envoy i.e. Envoy does not load balance requests to unhealthy/non-ready hosts even if the percentage of healthy hosts fall below minimum health percentage(panic threshold).
`PILOT_SIDECAR_USE_REMOTE_ADDRESS`	Boolean	`false`	UseRemoteAddress sets useRemoteAddress to true for side car outbound listeners.
`PILOT_SKIP_VALIDATE_TRUST_DOMAIN`	Boolean	`false`	Skip validating the peer is from the same trust domain when mTLS is enabled in authentication policy
`PILOT_STATUS_BURST`	Integer	`500`	If status is enabled, controls the Burst rate with which status will be updated. See https://godoc.org/k8s.io/client-go/rest#Config Burst
`PILOT_STATUS_MAX_WORKERS`	Integer	`100`	The maximum number of workers Pilot will use to keep configuration status up to date. Smaller numbers will result in higher status latency, but larger numbers may impact CPU in high scale environments.
`PILOT_STATUS_QPS`	Floating-Point	`100`	If status is enabled, controls the QPS with which status will be updated. See https://godoc.org/k8s.io/client-go/rest#Config QPS
`PILOT_STATUS_UPDATE_INTERVAL`	Time Duration	`500ms`	Interval to update the XDS distribution status.
`PILOT_TRACE_SAMPLING`	Floating-Point	`1`	Sets the mesh-wide trace sampling percentage. Should be 0.0 - 100.0. Precision to 0.01. Default is 1.0.
`PILOT_USE_ENDPOINT_SLICE`	Boolean	`false`	If enabled, Pilot will use EndpointSlices as the source of endpoints for Kubernetes services. By default, this is false, and Endpoints will be used. This requires the Kubernetes EndpointSlice controller to be enabled. Currently this is mutual exclusive - either Endpoints or EndpointSlices will be used
`PILOT_WORKLOAD_ENTRY_GRACE_PERIOD`	Time Duration	`10s`	The amount of time an auto-registered workload can remain disconnected from all Pilot instances before the associated WorkloadEntry is cleaned up.
`PILOT_XDS_CACHE_SIZE`	Integer	`60000`	The maximum number of cache entries for the XDS cache.
`PILOT_XDS_CACHE_STATS`	Boolean	`false`	If true, Pilot will collect metrics for XDS cache efficiency.
`PILOT_XDS_SEND_TIMEOUT`	Time Duration	`0s`	The timeout to send the XDS configuration to proxies. After this timeout is reached, Pilot will discard that push.
`POD_NAME`	String
`PRIORITIZED_LEADER_ELECTION`	Boolean	`true`	If enabled, the default revision will steal leader locks from non-default revisions
`REQUIRE_3P_TOKEN`	Boolean	`false`	Reject k8s default tokens, without audience. If false, default K8S token will be accepted
`RESOLVE_HOSTNAME_GATEWAYS`	Boolean	`true`	If true, hostnames in the LoadBalancer addresses of a Service will be resolved at the control plane for use in cross-network gateways.
`REWRITE_PROBE_LEGACY_LOCALHOST_DESTINATION`	Boolean	`false`	If enabled, readiness probes will be sent to 'localhost'. Otherwise, they will be sent to the Pod's IP, matching Kubernetes' behavior.
`REWRITE_TCP_PROBES`	Boolean	`true`	If false, TCP probes will not be rewritten and therefor always succeed when a sidecar is used.
`SHARED_MESH_CONFIG`	String		Additional config map to load for shared MeshConfig settings. The standard mesh config will take precedence.
`SIDECAR_IGNORE_PORT_IN_HOST_MATCH`	Boolean	`false`	If enabled, port will not be used in vhost domain matches.
`SPIFFE_BUNDLE_ENDPOINTS`	String		The SPIFFE bundle trust domain to endpoint mappings. Istiod retrieves the root certificate from each SPIFFE bundle endpoint and uses it to verify client certifiates from that trust domain. The endpoint must be compliant to the SPIFFE Bundle Endpoint standard. For details, please refer to https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE_Trust_Domain_and_Bundle.md . No need to configure this for root certificates issued via Istiod or web-PKI based root certificates. Use \|\| between <trustdomain, endpoint> tuples. Use \| as delimiter between trust domain and endpoint in each tuple. For example: foo\|https://url/for/foo\|\|bar\|https://url/for/bar
`TERM`	String		Specifies terminal type. Use 'dumb' to suppress color output
`TOKEN_AUDIENCES`	String	`istio-ca`	A list of comma separated audiences to check in the JWT token before issuing a certificate. The token is accepted if it matches with one of the audiences
`TRUSTED_GATEWAY_CIDR`	String		If set, any connections from gateway to Istiod with this CIDR range are treated as trusted for using authentication mechanisms like XFCC. This can only be used when the network where Istiod and the authenticating gateways are running in a trusted/secure network
`UNSAFE_ENABLE_ADMIN_ENDPOINTS`	Boolean	`false`	If this is set to true, dangerous admin endpoints will be exposed on the debug interface. Not recommended for production.
`UNSAFE_PILOT_ENABLE_DELTA_TEST`	Boolean	`false`	If enabled, addition runtime tests for Delta XDS efficiency are added. These checks are extremely expensive, so this should be used only for testing, not production.
`UNSAFE_PILOT_ENABLE_RUNTIME_ASSERTIONS`	Boolean	`false`	If enabled, addition runtime asserts will be performed. These checks are both expensive and panic on failure. As a result, this should be used only for testing.
`VALIDATION_WEBHOOK_CONFIG_NAME`	String	`istio-istio-system`	Name of the validatingwebhookconfiguration to patch. Empty will skip using cluster admin to patch.
`VERIFY_CERTIFICATE_AT_CLIENT`	Boolean	`false`	If enabled, certificates received by the proxy will be verified against the OS CA certificate bundle.
`VERIFY_SDS_CERTIFICATE`	Boolean	`true`	If enabled, certificates fetched from SDS server will be verified before sending back to proxy.
`XDS_AUTH`	Boolean	`true`	If true, will authenticate XDS clients.
`XDS_AUTH_PLAINTEXT`	Boolean	`false`	Authenticate plain text requests - used if Istiod is running on a secure/trusted network

Exported metrics

Metric Name	Type	Description
`auto_registration_deletes_total`	`Sum`	Total number of auto registration cleaned up by periodic timer.
`auto_registration_errors_total`	`Sum`	Total number of auto registration errors.
`auto_registration_success_total`	`Sum`	Total number of successful auto registrations.
`auto_registration_unregister_total`	`Sum`	Total number of unregistrations.
`auto_registration_updates_total`	`Sum`	Total number of auto registration updates.
`cache_flush_total`	`Sum`	number of times operator cache was flushed
`controller_sync_errors_total`	`Sum`	Total number of errorMetric syncing controllers.
`cr_deletion_total`	`Sum`	Number of IstioOperator CR deleted
`cr_merge_failure_total`	`Sum`	Number of IstioOperator CR merge failures
`cr_validation_error_total`	`Sum`	Number of IstioOperator CR validation failures
`endpoint_no_pod`	`LastValue`	Endpoints without an associated pod.
`get_cr_error_total`	`Sum`	Number of times fetching CR from apiserver failed
`istio_build`	`LastValue`	Istio component build info
`istiod_managed_clusters`	`LastValue`	Number of clusters managed by istiod
`legacy_path_translation_total`	`Sum`	Number of times a legacy API path is translated
`manifest_patch_error_total`	`Sum`	Number of times K8S patch overlays failed
`manifest_render_error_total`	`Sum`	Number of times error occurred during rendering output manifest
`num_outgoing_retries`	`Sum`	Number of outgoing retry requests (e.g. to a token exchange server, CA, etc.)
`owned_resource_total`	`LastValue`	Number of resources currently owned by the operator
`pilot_conflict_inbound_listener`	`LastValue`	Number of conflicting inbound listeners.
`pilot_conflict_outbound_listener_http_over_current_tcp`	`LastValue`	Number of conflicting wildcard http listeners with current wildcard tcp listener.
`pilot_conflict_outbound_listener_tcp_over_current_http`	`LastValue`	Number of conflicting wildcard tcp listeners with current wildcard http listener.
`pilot_conflict_outbound_listener_tcp_over_current_tcp`	`LastValue`	Number of conflicting tcp listeners with current tcp listener.
`pilot_destrule_subsets`	`LastValue`	Duplicate subsets across destination rules for same host
`pilot_duplicate_envoy_clusters`	`LastValue`	Duplicate envoy clusters caused by service entries with same hostname
`pilot_eds_no_instances`	`LastValue`	Number of clusters without instances.
`pilot_endpoint_not_ready`	`LastValue`	Endpoint found in unready state.
`pilot_inbound_updates`	`Sum`	Total number of updates received by pilot.
`pilot_jwks_resolver_network_fetch_fail_total`	`Sum`	Total number of failed network fetch by pilot jwks resolver
`pilot_jwks_resolver_network_fetch_success_total`	`Sum`	Total number of successfully network fetch by pilot jwks resolver
`pilot_k8s_cfg_events`	`Sum`	Events from k8s config.
`pilot_k8s_endpoints_pending_pod`	`LastValue`	Number of endpoints that do not currently have any corresponding pods.
`pilot_k8s_endpoints_with_no_pods`	`Sum`	Endpoints that does not have any corresponding pods.
`pilot_k8s_reg_events`	`Sum`	Events from k8s registry.
`pilot_no_ip`	`LastValue`	Pods not found in the endpoint table, possibly invalid.
`pilot_proxy_convergence_time`	`Distribution`	Delay in seconds between config change and a proxy receiving all required configuration.
`pilot_proxy_queue_time`	`Distribution`	Time in seconds, a proxy is in the push queue before being dequeued.
`pilot_push_triggers`	`Sum`	Total number of times a push was triggered, labeled by reason for the push.
`pilot_pushcontext_init_seconds`	`Distribution`	Total time in seconds Pilot takes to init pushContext.
`pilot_sds_certificate_errors_total`	`Sum`	Total number of failures to fetch SDS key and certificate.
`pilot_services`	`LastValue`	Total services known to pilot.
`pilot_total_rejected_configs`	`Sum`	Total number of configs that Pilot had to reject or ignore.
`pilot_total_xds_internal_errors`	`Sum`	Total number of internal XDS errors in pilot.
`pilot_total_xds_rejects`	`Sum`	Total number of XDS responses from pilot rejected by proxy.
`pilot_virt_services`	`LastValue`	Total virtual services known to pilot.
`pilot_vservice_dup_domain`	`LastValue`	Virtual services with dup domains.
`pilot_xds`	`LastValue`	Number of endpoints connected to this pilot using XDS.
`pilot_xds_cds_reject`	`LastValue`	Pilot rejected CDS configs.
`pilot_xds_config_size_bytes`	`Distribution`	Distribution of configuration sizes pushed to clients
`pilot_xds_delayed_push_timeouts_total`	`Sum`	Total number of XDS pushes that are delayed and timed out
`pilot_xds_delayed_pushes_total`	`Sum`	Total number of XDS pushes that are delayed.
`pilot_xds_eds_reject`	`LastValue`	Pilot rejected EDS.
`pilot_xds_expired_nonce`	`Sum`	Total number of XDS requests with an expired nonce.
`pilot_xds_lds_reject`	`LastValue`	Pilot rejected LDS.
`pilot_xds_push_context_errors`	`Sum`	Number of errors (timeouts) initiating push context.
`pilot_xds_push_time`	`Distribution`	Total time in seconds Pilot takes to push lds, rds, cds and eds.
`pilot_xds_pushes`	`Sum`	Pilot build and send errors for lds, rds, cds and eds.
`pilot_xds_rds_reject`	`LastValue`	Pilot rejected RDS.
`pilot_xds_send_time`	`Distribution`	Total time in seconds Pilot takes to send generated configuration.
`pilot_xds_write_timeout`	`Sum`	Pilot XDS response write timeouts.
`remote_cluster_sync_timeouts_total`	`Sum`	Number of times remote clusters took too long to sync, causing slow startup that excludes remote clusters.
`render_manifest_total`	`Sum`	Number of component manifests rendered
`resource_creation_total`	`Sum`	Number of resources created by the operator
`resource_deletion_total`	`Sum`	Number of resources deleted by the operator
`resource_prune_total`	`Sum`	Number of resources pruned by the operator
`resource_update_total`	`Sum`	Number of resources updated by the operator
`scrape_failures_total`	`Sum`	The total number of failed scrapes.
`scrapes_total`	`Sum`	The total number of scrapes.
`sidecar_injection_failure_total`	`Sum`	Total number of failed sidecar injection requests.
`sidecar_injection_requests_total`	`Sum`	Total number of sidecar injection requests.
`sidecar_injection_skip_total`	`Sum`	Total number of skipped sidecar injection requests.
`sidecar_injection_success_total`	`Sum`	Total number of successful sidecar injection requests.
`startup_duration_seconds`	`LastValue`	The time from the process starting to being marked ready.
`version`	`LastValue`	Version of operator binary
`wasm_cache_entries`	`LastValue`	number of Wasm remote fetch cache entries.
`wasm_cache_lookup_count`	`Sum`	number of Wasm remote fetch cache lookups.
`wasm_config_conversion_count`	`Sum`	number of Wasm config conversion count and results, including success, no remote load, marshal failure, remote fetch failure, miss remote fetch hint.
`wasm_config_conversion_duration`	`Distribution`	Total time in milliseconds istio-agent spends on converting remote load in Wasm config.
`wasm_remote_fetch_count`	`Sum`	number of Wasm remote fetches and results, including success, download failure, and checksum mismatch.
`webhook_patch_attempts_total`	`Sum`	Webhook patching attempts
`webhook_patch_failures_total`	`Sum`	Webhook patching total failures
`webhook_patch_retries_total`	`Sum`	Webhook patching retries
`xds_cache_dependent_config_size`	`LastValue`	Current size of dependent configs
`xds_cache_evictions`	`Sum`	Total number of xds cache evictions.
`xds_cache_reads`	`Sum`	Total number of xds cache xdsCacheReads.
`xds_cache_size`	`LastValue`	Current size of xds cache