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feat: Support aggregation options (#961)
* feat: Support aggregation options Signed-off-by: Jorge Turrado <[email protected]> * Updates Signed-off-by: Jorge Turrado <[email protected]> * Updates Signed-off-by: Jorge Turrado <[email protected]> * fix changelog Signed-off-by: Jorge Turrado <[email protected]> * style & codegen Signed-off-by: Jorge Turrado <[email protected]> * add mocks Signed-off-by: Jorge Turrado <[email protected]> * update docs Signed-off-by: Jorge Turrado <[email protected]> * fix e2e test Signed-off-by: Jorge Turrado <[email protected]> * merge issues Signed-off-by: Jorge Turrado <[email protected]> * update manifests Signed-off-by: Jorge Turrado <[email protected]> --------- Signed-off-by: Jorge Turrado <[email protected]>
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| # The `HTTPScaledObject` | ||
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| >This document reflects the specification of the `HTTPScaledObject` resource for the `v0.8.0` version. | ||
| Each `HTTPScaledObject` looks approximately like the below: | ||
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| ```yaml | ||
| kind: HTTPScaledObject | ||
| apiVersion: http.keda.sh/v1alpha1 | ||
| metadata: | ||
| name: xkcd | ||
| spec: | ||
| hosts: | ||
| - myhost.com | ||
| pathPrefixes: | ||
| - /test | ||
| scaleTargetRef: | ||
| name: xkcd | ||
| kind: Deployment | ||
| apiVersion: apps/v1 | ||
| service: xkcd | ||
| port: 8080 | ||
| replicas: | ||
| min: 5 | ||
| max: 10 | ||
| scaledownPeriod: 300 | ||
| scalingMetric: # requestRate and concurrency are mutually exclusive | ||
| requestRate: | ||
| granularity: 1s | ||
| targetValue: 100 | ||
| window: 1m | ||
| concurrency: | ||
| targetValue: 100 | ||
| ``` | ||
| This document is a narrated reference guide for the `HTTPScaledObject`, and we'll focus on the `spec` field. | ||
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| ## `hosts` | ||
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| These are the hosts to apply this scaling rule to. All incoming requests with one of these values in their `Host` header will be forwarded to the `Service` and port specified in the below `scaleTargetRef`, and that same `scaleTargetRef`'s workload will be scaled accordingly. | ||
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| ## `pathPrefixes` | ||
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| >Default: "/" | ||
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| These are the paths to apply this scaling rule to. All incoming requests with one of these values as path prefix will be forwarded to the `Service` and port specified in the below `scaleTargetRef`, and that same `scaleTargetRef`'s workload will be scaled accordingly. | ||
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| ## `scaleTargetRef` | ||
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| This is the primary and most important part of the `spec` because it describes: | ||
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| 1. The incoming host to apply this scaling rule to. | ||
| 2. What workload to scale. | ||
| 3. The service to which to route HTTP traffic. | ||
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| ### `deployment` (DEPRECTATED: removed as part of v0.9.0) | ||
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| This is the name of the `Deployment` to scale. It must exist in the same namespace as this `HTTPScaledObject` and shouldn't be managed by any other autoscaling system. This means that there should not be any `ScaledObject` already created for this `Deployment`. The HTTP Add-on will manage a `ScaledObject` internally. | ||
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| ### `name` | ||
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| This is the name of the workload to scale. It must exist in the same namespace as this `HTTPScaledObject` and shouldn't be managed by any other autoscaling system. This means that there should not be any `ScaledObject` already created for this workload. The HTTP Add-on will manage a `ScaledObject` internally. | ||
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| ### `kind` | ||
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| This is the kind of the workload to scale. | ||
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| ### `apiVersion` | ||
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| This is the apiVersion of the workload to scale. | ||
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| ### `service` | ||
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| This is the name of the service to route traffic to. The add-on will create autoscaling and routing components that route to this `Service`. It must exist in the same namespace as this `HTTPScaledObject` and should route to the same `Deployment` as you entered in the `deployment` field. | ||
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| ### `port` | ||
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| This is the port to route to on the service that you specified in the `service` field. It should be exposed on the service and should route to a valid `containerPort` on the `Deployment` you gave in the `deployment` field. | ||
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| ### `targetPendingRequests` (DEPRECTATED: removed as part of v0.9.0) | ||
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| >Default: 100 | ||
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| This is the number of _pending_ (or in-progress) requests that your application needs to have before the HTTP Add-on will scale it. Conversely, if your application has below this number of pending requests, the HTTP add-on will scale it down. | ||
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| For example, if you set this field to 100, the HTTP Add-on will scale your app up if it sees that there are 200 in-progress requests. On the other hand, it will scale down if it sees that there are only 20 in-progress requests. Note that it will _never_ scale your app to zero replicas unless there are _no_ requests in-progress. Even if you set this value to a very high number and only have a single in-progress request, your app will still have one replica. | ||
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| ### `scaledownPeriod` | ||
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| >Default: 300 | ||
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| The period to wait after the last reported active before scaling the resource back to 0. | ||
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| > Note: This time is measured on KEDA side based on in-flight requests, so workloads with few and random traffic could have unexpected scale to 0 cases. In those case we recommend to extend this period to ensure it doesn't happen. | ||
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| ## `scalingMetric` | ||
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| This is the second most important part of the `spec` because it describes how the workload has to scale. This section contains 2 nested sections (`requestRate` and `concurrency`) which are mutually exclusive between themselves. | ||
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| ### `requestRate` | ||
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| This section enables scaling based on the request rate. | ||
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| > **NOTE**: Requests information is stored in memory, aggragating long periods (longer than 5 minutes) or too fine granularity (less than 1 second) could produce perfomance issues or memory usage increase. | ||
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| > **NOTE 2**: Although updating `window` and/or `granularity` is something doable, the process just replaces all the stored request count infomation. This can produce unexpected scaling behaviours until the window is populated again. | ||
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| #### `targetValue` | ||
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| >Default: 100 | ||
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| This is the target value for the scaling configuration. | ||
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| #### `window` | ||
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| >Default: "1m" | ||
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| This value defines the aggregation window for the request rate calculation. | ||
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| #### `granularity` | ||
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| >Default: "1s" | ||
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| This value defines the granualarity of the aggregated requests for the request rate calculation. | ||
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| ### `concurrency` | ||
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| This section enables scaling based on the request concurrency. | ||
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| > **NOTE**: This is the only scaling behaviour before v0.8.0 | ||
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| #### `targetValue` | ||
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| >Default: 100 | ||
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| This is the target value for the scaling configuration. |
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