Keda podspec (#2021)

* Add podspec to MQT

Signed-off-by: Harsh Thakur <harshthakur9030@gmail.com>

* Add preupgrade check

Signed-off-by: Harsh Thakur <harshthakur9030@gmail.com>

* Use zap logger

Signed-off-by: Harsh Thakur <harshthakur9030@gmail.com>

Co-authored-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/apis/core/v1/types.go

@@ -490,6 +490,7 @@ type (
 		// Function Reference by weight. this map contains function name as key and its weight
 		// as the value. This is for canary upgrade purpose.
 		// +nullable
+		// +optional
 		FunctionWeights map[string]int `json:"functionweights"`
 	}
 
@@ -768,6 +769,16 @@ type (
 		// Kind of Message Queue Trigger to be created, by default its fission
 		// +optional
 		MqtKind string `json:"mqtkind,omitempty"`
+
+		// (Optional) Podspec allows modification of deployed runtime pod with Kubernetes PodSpec
+		// The merging logic is briefly described below and detailed MergePodSpec function
+		// - Volumes mounts and env variables for function and fetcher container are appended
+		// - All additional containers and init containers are appended
+		// - Volume definitions are appended
+		// - Lists such as tolerations, ImagePullSecrets, HostAliases are appended
+		// - Structs are merged and variables from pod spec take precedence
+		// +optional
+		PodSpec *apiv1.PodSpec `json:"podspec,omitempty"`
 	}
 
 	// TimeTriggerSpec invokes the specific function at a time or

pkg/apis/core/v1/zz_generated.deepcopy.go

@@ -737,6 +737,11 @@ func (in *MessageQueueTriggerSpec) DeepCopyInto(out *MessageQueueTriggerSpec) {
 			(*out)[key] = val
 		}
 	}
+	if in.PodSpec != nil {
+		in, out := &in.PodSpec, &out.PodSpec
+		*out = new(corev1.PodSpec)
+		(*in).DeepCopyInto(*out)
+	}
 	return
 }