add pod-level process stats to the summary API for out-of-pid eviction

Author: dashpole

keps/sig-node/20190129-pid-limiting.md

@@ -159,6 +159,28 @@ GA
 
 Adding support for pid limiting at the Node Allocatable level 
 
+Eviction will rank based on priority, followed by the number of processes used.
+To integrate this into the eviction manager's control loops, we will add pod-level
+ProcessStats:
+
+```golang
+// ProcessStats are stats pertaining to processes.
+type ProcessStats struct {
+ // Number of processes
+ // +optional
+ ProcessCount *uint64 `json:"process_count,omitempty"`
+}
+
+// PodStats holds pod-level unprocessed sample stats.
+type PodStats struct { type PodStats struct {
+ ...
+ // ProcessStats pertaining to processes.
+ // +optional
+ ProcessStats *ProcessStats `json:"process_stats,omitempty"`
+}
+```
+
+
 The following criteria applies to `SupportNodePidsLimit`:
 
 Alpha