Implement pod resource metrics as described in KEP 1916. The new
`/metrics/resources` endpoint is exposed on the active scheduler
and reports kube_pod_resources* metrics that present the effective
requests and limits for all resources on the pods as calculated by
the scheduler and kubelet. This allows administrators using the
system to quickly perform resource consumption, reservation, and
pending utilization calculations when those metrics are read.
Because metrics calculation is on-demand, there is no additional
resource consumption incurred by the scheduler unless the endpoint
is scraped.
Pod and burstable QoS cgroups should take overhead of running a sandbox
into account if the PodOverhead feature is enabled. These helper
functions are utilized by Kubelet for sizing the pod and burstable QoS
cgroups.
Pod overhead is added to resource requests, regardless of the initial
request values. A particular resource pod overhead is only added to a
resource limit if a non-zero limit already existed.
This commit updates eviction handling to also take Pod Overhead into
account (if the feature is enabled).
Signed-off-by: Eric Ernst <eric.ernst@intel.com>
Update GetResoureqRequest function to utilize a new helper,
GetResourceRequestQuantity. This logic was duplicated in a couple of
areas in the K/K codebase, so consolidating for better test coverage.
Signed-off-by: Eric Ernst <eric.ernst@intel.com>
