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documentation for MaxConcurrentReconciles #592

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Nov 23, 2021
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documentation for MaxConcurrentReconciles #592

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16 changes: 16 additions & 0 deletions content/docs/2.5/operate/cluster.md
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Expand Up @@ -68,4 +68,20 @@ The Kubernetes client config used within KEDA Metrics Adapter can be adjusted by
| kube-api-qps | cfg.QPS | 20.0 | Set the QPS rate for throttling requests sent to the apiserver |
| kube-api-burst | cfg.Burst | 30 | Set the burst for throttling requests sent to the apiserver |

## Configure `MaxConcurrentReconciles` for Controllers

To implement internal controllers KEDA uses [controller-runtime project](https://github.com/kubernetes-sigs/controller-runtime), that enables configuration of [MaxConcurrentReconciles property](https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/controller#Options), ie. the maximum number of concurrent reconciles which can be run for a controller.

KEDA Operator exposes properties for specifying `MaxConcurrentReconciles` for following controllers/reconcilers:
- `ScaledObjectReconciler` - responsible for watching and managing `ScaledObjects`, ie. validates input trigger specification, starts scaling logic and manages dependent HPA.
- `ScaledJobReconciler` - responsible for watching and managing `ScaledJobs` and dependent Kubernetes Jobs

KEDA Metrics Server exposes property for specifying `MaxConcurrentReconciles` for `MetricsScaledObjectReconciler`, that manages Metrics Names exposes by KEDA and which are being consumed by Kubernetes server and HPA controller.

To modify this properties you can set environment variables on both KEDA Operator and Metrics Server Deployments:

| Environment variable name | Deployment | Default Value | Affected reconciler |
| ------------------------------------- | -------------- | ------------- | -------------------------------------------------------------- |
| KEDA_SCALEDOBJECT_CTRL_MAX_RECONCILES | Operator | 5 | ScaledObjectReconciler |
| KEDA_SCALEDJOB_CTRL_MAX_RECONCILES | Operator | 1 | ScaledJobReconciler |
| KEDA_METRICS_CTRL_MAX_RECONCILES | Metrics Server | 1 | MetricsScaledObjectReconciler |