rebase: update K8s packages to v0.32.1

Update K8s packages in go.mod to v0.32.1

Signed-off-by: Praveen M <m.praveen@ibm.com>

vendor/github.com/google/cadvisor/summary/summary.go

@@ -0,0 +1,184 @@
+// Copyright 2015 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Maintains the summary of aggregated minute, hour, and day stats.
+// For a container running for more than a day, amount of tracked data can go up to
+// 40 KB when cpu and memory are tracked. We'll start by enabling collection for the
+// node, followed by docker, and then all containers as we understand the usage pattern
+// better
+// TODO(rjnagal): Optimize the size if we start running it for every container.
+package summary
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	v1 "github.com/google/cadvisor/info/v1"
+	info "github.com/google/cadvisor/info/v2"
+)
+
+// Usage fields we track for generating percentiles.
+type secondSample struct {
+	Timestamp time.Time // time when the sample was recorded.
+	Cpu       uint64    // cpu usage
+	Memory    uint64    // memory usage
+}
+
+type availableResources struct {
+	Cpu    bool
+	Memory bool
+}
+
+type StatsSummary struct {
+	// Resources being tracked for this container.
+	available availableResources
+	// list of second samples. The list is cleared when a new minute samples is generated.
+	secondSamples []*secondSample
+	// minute percentiles. We track 24 * 60 maximum samples.
+	minuteSamples *SamplesBuffer
+	// latest derived instant, minute, hour, and day stats. Instant sample updated every second.
+	// Others updated every minute.
+	derivedStats info.DerivedStats // Guarded by dataLock.
+	dataLock     sync.RWMutex
+}
+
+// Adds a new seconds sample.
+// If enough seconds samples are collected, a minute sample is generated and derived
+// stats are updated.
+func (s *StatsSummary) AddSample(stat v1.ContainerStats) error {
+	sample := secondSample{}
+	sample.Timestamp = stat.Timestamp
+	if s.available.Cpu {
+		sample.Cpu = stat.Cpu.Usage.Total
+	}
+	if s.available.Memory {
+		sample.Memory = stat.Memory.WorkingSet
+	}
+	s.secondSamples = append(s.secondSamples, &sample)
+	s.updateLatestUsage()
+	// TODO(jnagal): Use 'available' to avoid unnecessary computation.
+	numSamples := len(s.secondSamples)
+	elapsed := time.Nanosecond
+	if numSamples > 1 {
+		start := s.secondSamples[0].Timestamp
+		end := s.secondSamples[numSamples-1].Timestamp
+		elapsed = end.Sub(start)
+	}
+	if elapsed > 60*time.Second {
+		// Make a minute sample. This works with dynamic housekeeping as long
+		// as we keep max dynamic housekeeping period close to a minute.
+		minuteSample := GetMinutePercentiles(s.secondSamples)
+		// Clear seconds samples. Keep the latest sample for continuity.
+		// Copying and resizing helps avoid slice re-allocation.
+		s.secondSamples[0] = s.secondSamples[numSamples-1]
+		s.secondSamples = s.secondSamples[:1]
+		s.minuteSamples.Add(minuteSample)
+		err := s.updateDerivedStats()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *StatsSummary) updateLatestUsage() {
+	usage := info.InstantUsage{}
+	numStats := len(s.secondSamples)
+	if numStats < 1 {
+		return
+	}
+	latest := s.secondSamples[numStats-1]
+	usage.Memory = latest.Memory
+	if numStats > 1 {
+		previous := s.secondSamples[numStats-2]
+		cpu, err := getCPURate(*latest, *previous)
+		if err == nil {
+			usage.Cpu = cpu
+		}
+	}
+
+	s.dataLock.Lock()
+	defer s.dataLock.Unlock()
+	s.derivedStats.LatestUsage = usage
+	s.derivedStats.Timestamp = latest.Timestamp
+}
+
+// Generate new derived stats based on current minute stats samples.
+func (s *StatsSummary) updateDerivedStats() error {
+	derived := info.DerivedStats{}
+	derived.Timestamp = time.Now()
+	minuteSamples := s.minuteSamples.RecentStats(1)
+	if len(minuteSamples) != 1 {
+		return fmt.Errorf("failed to retrieve minute stats")
+	}
+	derived.MinuteUsage = *minuteSamples[0]
+	hourUsage, err := s.getDerivedUsage(60)
+	if err != nil {
+		return fmt.Errorf("failed to compute hour stats: %v", err)
+	}
+	dayUsage, err := s.getDerivedUsage(60 * 24)
+	if err != nil {
+		return fmt.Errorf("failed to compute day usage: %v", err)
+	}
+	derived.HourUsage = hourUsage
+	derived.DayUsage = dayUsage
+
+	s.dataLock.Lock()
+	defer s.dataLock.Unlock()
+	derived.LatestUsage = s.derivedStats.LatestUsage
+	s.derivedStats = derived
+
+	return nil
+}
+
+// helper method to get hour and daily derived stats
+func (s *StatsSummary) getDerivedUsage(n int) (info.Usage, error) {
+	if n < 1 {
+		return info.Usage{}, fmt.Errorf("invalid number of samples requested: %d", n)
+	}
+	samples := s.minuteSamples.RecentStats(n)
+	numSamples := len(samples)
+	if numSamples < 1 {
+		return info.Usage{}, fmt.Errorf("failed to retrieve any minute stats")
+	}
+	// We generate derived stats even with partial data.
+	usage := GetDerivedPercentiles(samples)
+	// Assumes we have equally placed minute samples.
+	usage.PercentComplete = int32(numSamples * 100 / n)
+	return usage, nil
+}
+
+// Return the latest calculated derived stats.
+func (s *StatsSummary) DerivedStats() (info.DerivedStats, error) {
+	s.dataLock.RLock()
+	defer s.dataLock.RUnlock()
+
+	return s.derivedStats, nil
+}
+
+func New(spec v1.ContainerSpec) (*StatsSummary, error) {
+	summary := StatsSummary{}
+	if spec.HasCpu {
+		summary.available.Cpu = true
+	}
+	if spec.HasMemory {
+		summary.available.Memory = true
+	}
+	if !summary.available.Cpu && !summary.available.Memory {
+		return nil, fmt.Errorf("none of the resources are being tracked")
+	}
+	summary.minuteSamples = NewSamplesBuffer(60 /* one hour */)
+	return &summary, nil
+}