Chapter 7. PriorityLevelConfiguration [flowcontrol.apiserver.k8s.io/v1] Description PriorityLevelConfiguration represents the configuration of a priority level. Type object 7.1. Specification Property Type Description apiVersion string APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources kind string Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds metadata ObjectMeta metadata is the standard object's metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata spec object PriorityLevelConfigurationSpec specifies the configuration of a priority level. status object PriorityLevelConfigurationStatus represents the current state of a "request-priority". 7.1.1. .spec Description PriorityLevelConfigurationSpec specifies the configuration of a priority level. Type object Required type Property Type Description exempt object ExemptPriorityLevelConfiguration describes the configurable aspects of the handling of exempt requests. In the mandatory exempt configuration object the values in the fields here can be modified by authorized users, unlike the rest of the spec . limited object LimitedPriorityLevelConfiguration specifies how to handle requests that are subject to limits. It addresses two issues: - How are requests for this priority level limited? - What should be done with requests that exceed the limit? type string type indicates whether this priority level is subject to limitation on request execution. A value of "Exempt" means that requests of this priority level are not subject to a limit (and thus are never queued) and do not detract from the capacity made available to other priority levels. A value of "Limited" means that (a) requests of this priority level are subject to limits and (b) some of the server's limited capacity is made available exclusively to this priority level. Required. 7.1.2. .spec.exempt Description ExemptPriorityLevelConfiguration describes the configurable aspects of the handling of exempt requests. In the mandatory exempt configuration object the values in the fields here can be modified by authorized users, unlike the rest of the spec . Type object Property Type Description lendablePercent integer lendablePercent prescribes the fraction of the level's NominalCL that can be borrowed by other priority levels. This value of this field must be between 0 and 100, inclusive, and it defaults to 0. The number of seats that other levels can borrow from this level, known as this level's LendableConcurrencyLimit (LendableCL), is defined as follows. LendableCL(i) = round( NominalCL(i) * lendablePercent(i)/100.0 ) nominalConcurrencyShares integer nominalConcurrencyShares (NCS) contributes to the computation of the NominalConcurrencyLimit (NominalCL) of this level. This is the number of execution seats nominally reserved for this priority level. This DOES NOT limit the dispatching from this priority level but affects the other priority levels through the borrowing mechanism. The server's concurrency limit (ServerCL) is divided among all the priority levels in proportion to their NCS values: NominalCL(i) = ceil( ServerCL * NCS(i) / sum_ncs ) sum_ncs = sum[priority level k] NCS(k) Bigger numbers mean a larger nominal concurrency limit, at the expense of every other priority level. This field has a default value of zero. 7.1.3. .spec.limited Description LimitedPriorityLevelConfiguration specifies how to handle requests that are subject to limits. It addresses two issues: - How are requests for this priority level limited? - What should be done with requests that exceed the limit? Type object Property Type Description borrowingLimitPercent integer borrowingLimitPercent , if present, configures a limit on how many seats this priority level can borrow from other priority levels. The limit is known as this level's BorrowingConcurrencyLimit (BorrowingCL) and is a limit on the total number of seats that this level may borrow at any one time. This field holds the ratio of that limit to the level's nominal concurrency limit. When this field is non-nil, it must hold a non-negative integer and the limit is calculated as follows. BorrowingCL(i) = round( NominalCL(i) * borrowingLimitPercent(i)/100.0 ) The value of this field can be more than 100, implying that this priority level can borrow a number of seats that is greater than its own nominal concurrency limit (NominalCL). When this field is left nil , the limit is effectively infinite. lendablePercent integer lendablePercent prescribes the fraction of the level's NominalCL that can be borrowed by other priority levels. The value of this field must be between 0 and 100, inclusive, and it defaults to 0. The number of seats that other levels can borrow from this level, known as this level's LendableConcurrencyLimit (LendableCL), is defined as follows. LendableCL(i) = round( NominalCL(i) * lendablePercent(i)/100.0 ) limitResponse object LimitResponse defines how to handle requests that can not be executed right now. nominalConcurrencyShares integer nominalConcurrencyShares (NCS) contributes to the computation of the NominalConcurrencyLimit (NominalCL) of this level. This is the number of execution seats available at this priority level. This is used both for requests dispatched from this priority level as well as requests dispatched from other priority levels borrowing seats from this level. The server's concurrency limit (ServerCL) is divided among the Limited priority levels in proportion to their NCS values: NominalCL(i) = ceil( ServerCL * NCS(i) / sum_ncs ) sum_ncs = sum[priority level k] NCS(k) Bigger numbers mean a larger nominal concurrency limit, at the expense of every other priority level. If not specified, this field defaults to a value of 30. Setting this field to zero supports the construction of a "jail" for this priority level that is used to hold some request(s) 7.1.4. .spec.limited.limitResponse Description LimitResponse defines how to handle requests that can not be executed right now. Type object Required type Property Type Description queuing object QueuingConfiguration holds the configuration parameters for queuing type string type is "Queue" or "Reject". "Queue" means that requests that can not be executed upon arrival are held in a queue until they can be executed or a queuing limit is reached. "Reject" means that requests that can not be executed upon arrival are rejected. Required. 7.1.5. .spec.limited.limitResponse.queuing Description QueuingConfiguration holds the configuration parameters for queuing Type object Property Type Description handSize integer handSize is a small positive number that configures the shuffle sharding of requests into queues. When enqueuing a request at this priority level the request's flow identifier (a string pair) is hashed and the hash value is used to shuffle the list of queues and deal a hand of the size specified here. The request is put into one of the shortest queues in that hand. handSize must be no larger than queues , and should be significantly smaller (so that a few heavy flows do not saturate most of the queues). See the user-facing documentation for more extensive guidance on setting this field. This field has a default value of 8. queueLengthLimit integer queueLengthLimit is the maximum number of requests allowed to be waiting in a given queue of this priority level at a time; excess requests are rejected. This value must be positive. If not specified, it will be defaulted to 50. queues integer queues is the number of queues for this priority level. The queues exist independently at each apiserver. The value must be positive. Setting it to 1 effectively precludes shufflesharding and thus makes the distinguisher method of associated flow schemas irrelevant. This field has a default value of 64. 7.1.6. .status Description PriorityLevelConfigurationStatus represents the current state of a "request-priority". Type object Property Type Description conditions array conditions is the current state of "request-priority". conditions[] object PriorityLevelConfigurationCondition defines the condition of priority level. 7.1.7. .status.conditions Description conditions is the current state of "request-priority". Type array 7.1.8. .status.conditions[] Description PriorityLevelConfigurationCondition defines the condition of priority level. Type object Property Type Description lastTransitionTime Time lastTransitionTime is the last time the condition transitioned from one status to another. message string message is a human-readable message indicating details about last transition. reason string reason is a unique, one-word, CamelCase reason for the condition's last transition. status string status is the status of the condition. Can be True, False, Unknown. Required. type string type is the type of the condition. Required. 7.2. API endpoints The following API endpoints are available: /apis/flowcontrol.apiserver.k8s.io/v1/prioritylevelconfigurations DELETE : delete collection of PriorityLevelConfiguration GET : list or watch objects of kind PriorityLevelConfiguration POST : create a PriorityLevelConfiguration /apis/flowcontrol.apiserver.k8s.io/v1/watch/prioritylevelconfigurations GET : watch individual changes to a list of PriorityLevelConfiguration. deprecated: use the 'watch' parameter with a list operation instead. /apis/flowcontrol.apiserver.k8s.io/v1/prioritylevelconfigurations/{name} DELETE : delete a PriorityLevelConfiguration GET : read the specified PriorityLevelConfiguration PATCH : partially update the specified PriorityLevelConfiguration PUT : replace the specified PriorityLevelConfiguration /apis/flowcontrol.apiserver.k8s.io/v1/watch/prioritylevelconfigurations/{name} GET : watch changes to an object of kind PriorityLevelConfiguration. deprecated: use the 'watch' parameter with a list operation instead, filtered to a single item with the 'fieldSelector' parameter. /apis/flowcontrol.apiserver.k8s.io/v1/prioritylevelconfigurations/{name}/status GET : read status of the specified PriorityLevelConfiguration PATCH : partially update status of the specified PriorityLevelConfiguration PUT : replace status of the specified PriorityLevelConfiguration 7.2.1. /apis/flowcontrol.apiserver.k8s.io/v1/prioritylevelconfigurations HTTP method DELETE Description delete collection of PriorityLevelConfiguration Table 7.1. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed Table 7.2. HTTP responses HTTP code Reponse body 200 - OK Status schema 401 - Unauthorized Empty HTTP method GET Description list or watch objects of kind PriorityLevelConfiguration Table 7.3. HTTP responses HTTP code Reponse body 200 - OK PriorityLevelConfigurationList schema 401 - Unauthorized Empty HTTP method POST Description create a PriorityLevelConfiguration Table 7.4. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 7.5. Body parameters Parameter Type Description body PriorityLevelConfiguration schema Table 7.6. HTTP responses HTTP code Reponse body 200 - OK PriorityLevelConfiguration schema 201 - Created PriorityLevelConfiguration schema 202 - Accepted PriorityLevelConfiguration schema 401 - Unauthorized Empty 7.2.2. /apis/flowcontrol.apiserver.k8s.io/v1/watch/prioritylevelconfigurations HTTP method GET Description watch individual changes to a list of PriorityLevelConfiguration. deprecated: use the 'watch' parameter with a list operation instead. Table 7.7. HTTP responses HTTP code Reponse body 200 - OK WatchEvent schema 401 - Unauthorized Empty 7.2.3. /apis/flowcontrol.apiserver.k8s.io/v1/prioritylevelconfigurations/{name} Table 7.8. Global path parameters Parameter Type Description name string name of the PriorityLevelConfiguration HTTP method DELETE Description delete a PriorityLevelConfiguration Table 7.9. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed Table 7.10. HTTP responses HTTP code Reponse body 200 - OK Status schema 202 - Accepted Status schema 401 - Unauthorized Empty HTTP method GET Description read the specified PriorityLevelConfiguration Table 7.11. HTTP responses HTTP code Reponse body 200 - OK PriorityLevelConfiguration schema 401 - Unauthorized Empty HTTP method PATCH Description partially update the specified PriorityLevelConfiguration Table 7.12. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 7.13. HTTP responses HTTP code Reponse body 200 - OK PriorityLevelConfiguration schema 201 - Created PriorityLevelConfiguration schema 401 - Unauthorized Empty HTTP method PUT Description replace the specified PriorityLevelConfiguration Table 7.14. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 7.15. Body parameters Parameter Type Description body PriorityLevelConfiguration schema Table 7.16. HTTP responses HTTP code Reponse body 200 - OK PriorityLevelConfiguration schema 201 - Created PriorityLevelConfiguration schema 401 - Unauthorized Empty 7.2.4. /apis/flowcontrol.apiserver.k8s.io/v1/watch/prioritylevelconfigurations/{name} Table 7.17. Global path parameters Parameter Type Description name string name of the PriorityLevelConfiguration HTTP method GET Description watch changes to an object of kind PriorityLevelConfiguration. deprecated: use the 'watch' parameter with a list operation instead, filtered to a single item with the 'fieldSelector' parameter. Table 7.18. HTTP responses HTTP code Reponse body 200 - OK WatchEvent schema 401 - Unauthorized Empty 7.2.5. /apis/flowcontrol.apiserver.k8s.io/v1/prioritylevelconfigurations/{name}/status Table 7.19. Global path parameters Parameter Type Description name string name of the PriorityLevelConfiguration HTTP method GET Description read status of the specified PriorityLevelConfiguration Table 7.20. HTTP responses HTTP code Reponse body 200 - OK PriorityLevelConfiguration schema 401 - Unauthorized Empty HTTP method PATCH Description partially update status of the specified PriorityLevelConfiguration Table 7.21. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 7.22. HTTP responses HTTP code Reponse body 200 - OK PriorityLevelConfiguration schema 201 - Created PriorityLevelConfiguration schema 401 - Unauthorized Empty HTTP method PUT Description replace status of the specified PriorityLevelConfiguration Table 7.23. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 7.24. Body parameters Parameter Type Description body PriorityLevelConfiguration schema Table 7.25. HTTP responses HTTP code Reponse body 200 - OK PriorityLevelConfiguration schema 201 - Created PriorityLevelConfiguration schema 401 - Unauthorized Empty

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