分布式PDB洞察

// PodDisruptionBudgetSpec is a description of a PodDisruptionBudget.
type PodDisruptionBudgetSpec struct {
	// An eviction is allowed if at least "minAvailable" pods selected by
	// "selector" will still be available after the eviction, i.e. even in the
	// absence of the evicted pod.  So for example you can prevent all voluntary
	// evictions by specifying "100%".
	// +optional
	MinAvailable *intstr.IntOrString

	// Label query over pods whose evictions are managed by the disruption
	// budget.
	// +optional
	Selector *metav1.LabelSelector

	// An eviction is allowed if at most "maxUnavailable" pods selected by
	// "selector" are unavailable after the eviction, i.e. even in absence of
	// the evicted pod. For example, one can prevent all voluntary evictions
	// by specifying 0. This is a mutually exclusive setting with "minAvailable".
	// +optional
	MaxUnavailable *intstr.IntOrString

	// UnhealthyPodEvictionPolicy defines the criteria for when unhealthy pods
	// should be considered for eviction. Current implementation considers healthy pods,
	// as pods that have status.conditions item with type="Ready",status="True".
	//
	// Valid policies are IfHealthyBudget and AlwaysAllow.
	// If no policy is specified, the default behavior will be used,
	// which corresponds to the IfHealthyBudget policy.
	//
	// IfHealthyBudget policy means that running pods (status.phase="Running"),
	// but not yet healthy can be evicted only if the guarded application is not
	// disrupted (status.currentHealthy is at least equal to status.desiredHealthy).
	// Healthy pods will be subject to the PDB for eviction.
	//
	// AlwaysAllow policy means that all running pods (status.phase="Running"),
	// but not yet healthy are considered disrupted and can be evicted regardless
	// of whether the criteria in a PDB is met. This means perspective running
	// pods of a disrupted application might not get a chance to become healthy.
	// Healthy pods will be subject to the PDB for eviction.
	//
	// Additional policies may be added in the future.
	// Clients making eviction decisions should disallow eviction of unhealthy pods
	// if they encounter an unrecognized policy in this field.
	//
	// This field is beta-level. The eviction API uses this field when
	// the feature gate PDBUnhealthyPodEvictionPolicy is enabled (enabled by default).
	// +optional
    // 定义条件来判定何时应考虑驱逐不健康的 Pod
	UnhealthyPodEvictionPolicy *UnhealthyPodEvictionPolicyType
}