mirror of
https://github.com/k3s-io/k3s.git
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375 lines
13 KiB
Go
375 lines
13 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"fmt"
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"sync"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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corev1 "k8s.io/api/core/v1"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/klog"
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"k8s.io/kubernetes/pkg/features"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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)
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const (
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KubeletSubsystem = "kubelet"
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PodWorkerLatencyKey = "pod_worker_latency_microseconds"
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PodStartLatencyKey = "pod_start_latency_microseconds"
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CgroupManagerOperationsKey = "cgroup_manager_latency_microseconds"
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PodWorkerStartLatencyKey = "pod_worker_start_latency_microseconds"
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PLEGRelistLatencyKey = "pleg_relist_latency_microseconds"
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PLEGRelistIntervalKey = "pleg_relist_interval_microseconds"
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EvictionStatsAgeKey = "eviction_stats_age_microseconds"
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VolumeStatsCapacityBytesKey = "volume_stats_capacity_bytes"
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VolumeStatsAvailableBytesKey = "volume_stats_available_bytes"
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VolumeStatsUsedBytesKey = "volume_stats_used_bytes"
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VolumeStatsInodesKey = "volume_stats_inodes"
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VolumeStatsInodesFreeKey = "volume_stats_inodes_free"
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VolumeStatsInodesUsedKey = "volume_stats_inodes_used"
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// Metrics keys of remote runtime operations
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RuntimeOperationsKey = "runtime_operations"
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RuntimeOperationsLatencyKey = "runtime_operations_latency_microseconds"
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RuntimeOperationsErrorsKey = "runtime_operations_errors"
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// Metrics keys of device plugin operations
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DevicePluginRegistrationCountKey = "device_plugin_registration_count"
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DevicePluginAllocationLatencyKey = "device_plugin_alloc_latency_microseconds"
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// Metric keys for node config
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AssignedConfigKey = "node_config_assigned"
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ActiveConfigKey = "node_config_active"
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LastKnownGoodConfigKey = "node_config_last_known_good"
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ConfigErrorKey = "node_config_error"
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ConfigSourceLabelKey = "node_config_source"
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ConfigSourceLabelValueLocal = "local"
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ConfigUIDLabelKey = "node_config_uid"
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ConfigResourceVersionLabelKey = "node_config_resource_version"
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KubeletConfigKeyLabelKey = "node_config_kubelet_key"
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)
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var (
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ContainersPerPodCount = prometheus.NewSummary(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: "containers_per_pod_count",
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Help: "The number of containers per pod.",
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},
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)
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PodWorkerLatency = prometheus.NewSummaryVec(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: PodWorkerLatencyKey,
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Help: "Latency in microseconds to sync a single pod. Broken down by operation type: create, update, or sync",
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},
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[]string{"operation_type"},
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)
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PodStartLatency = prometheus.NewSummary(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: PodStartLatencyKey,
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Help: "Latency in microseconds for a single pod to go from pending to running.",
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},
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)
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CgroupManagerLatency = prometheus.NewSummaryVec(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: CgroupManagerOperationsKey,
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Help: "Latency in microseconds for cgroup manager operations. Broken down by method.",
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},
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[]string{"operation_type"},
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)
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PodWorkerStartLatency = prometheus.NewSummary(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: PodWorkerStartLatencyKey,
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Help: "Latency in microseconds from seeing a pod to starting a worker.",
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},
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)
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PLEGRelistLatency = prometheus.NewSummary(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: PLEGRelistLatencyKey,
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Help: "Latency in microseconds for relisting pods in PLEG.",
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},
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)
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PLEGRelistInterval = prometheus.NewSummary(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: PLEGRelistIntervalKey,
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Help: "Interval in microseconds between relisting in PLEG.",
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},
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)
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// Metrics of remote runtime operations.
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RuntimeOperations = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: RuntimeOperationsKey,
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Help: "Cumulative number of runtime operations by operation type.",
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},
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[]string{"operation_type"},
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)
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RuntimeOperationsLatency = prometheus.NewSummaryVec(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: RuntimeOperationsLatencyKey,
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Help: "Latency in microseconds of runtime operations. Broken down by operation type.",
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},
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[]string{"operation_type"},
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)
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RuntimeOperationsErrors = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: RuntimeOperationsErrorsKey,
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Help: "Cumulative number of runtime operation errors by operation type.",
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},
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[]string{"operation_type"},
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)
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EvictionStatsAge = prometheus.NewSummaryVec(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: EvictionStatsAgeKey,
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Help: "Time between when stats are collected, and when pod is evicted based on those stats by eviction signal",
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},
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[]string{"eviction_signal"},
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)
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DevicePluginRegistrationCount = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: DevicePluginRegistrationCountKey,
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Help: "Cumulative number of device plugin registrations. Broken down by resource name.",
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},
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[]string{"resource_name"},
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)
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DevicePluginAllocationLatency = prometheus.NewSummaryVec(
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prometheus.SummaryOpts{
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Subsystem: KubeletSubsystem,
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Name: DevicePluginAllocationLatencyKey,
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Help: "Latency in microseconds to serve a device plugin Allocation request. Broken down by resource name.",
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},
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[]string{"resource_name"},
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)
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// Metrics for node config
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AssignedConfig = prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: AssignedConfigKey,
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Help: "The node's understanding of intended config. The count is always 1.",
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},
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[]string{ConfigSourceLabelKey, ConfigUIDLabelKey, ConfigResourceVersionLabelKey, KubeletConfigKeyLabelKey},
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)
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ActiveConfig = prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: ActiveConfigKey,
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Help: "The config source the node is actively using. The count is always 1.",
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},
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[]string{ConfigSourceLabelKey, ConfigUIDLabelKey, ConfigResourceVersionLabelKey, KubeletConfigKeyLabelKey},
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)
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LastKnownGoodConfig = prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: LastKnownGoodConfigKey,
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Help: "The config source the node will fall back to when it encounters certain errors. The count is always 1.",
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},
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[]string{ConfigSourceLabelKey, ConfigUIDLabelKey, ConfigResourceVersionLabelKey, KubeletConfigKeyLabelKey},
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)
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ConfigError = prometheus.NewGauge(
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prometheus.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: ConfigErrorKey,
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Help: "This metric is true (1) if the node is experiencing a configuration-related error, false (0) otherwise.",
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},
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)
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)
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var registerMetrics sync.Once
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// Register all metrics.
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func Register(containerCache kubecontainer.RuntimeCache, collectors ...prometheus.Collector) {
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// Register the metrics.
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registerMetrics.Do(func() {
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prometheus.MustRegister(PodWorkerLatency)
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prometheus.MustRegister(PodStartLatency)
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prometheus.MustRegister(CgroupManagerLatency)
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prometheus.MustRegister(PodWorkerStartLatency)
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prometheus.MustRegister(ContainersPerPodCount)
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prometheus.MustRegister(newPodAndContainerCollector(containerCache))
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prometheus.MustRegister(PLEGRelistLatency)
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prometheus.MustRegister(PLEGRelistInterval)
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prometheus.MustRegister(RuntimeOperations)
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prometheus.MustRegister(RuntimeOperationsLatency)
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prometheus.MustRegister(RuntimeOperationsErrors)
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prometheus.MustRegister(EvictionStatsAge)
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prometheus.MustRegister(DevicePluginRegistrationCount)
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prometheus.MustRegister(DevicePluginAllocationLatency)
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if utilfeature.DefaultFeatureGate.Enabled(features.DynamicKubeletConfig) {
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prometheus.MustRegister(AssignedConfig)
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prometheus.MustRegister(ActiveConfig)
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prometheus.MustRegister(LastKnownGoodConfig)
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prometheus.MustRegister(ConfigError)
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}
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for _, collector := range collectors {
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prometheus.MustRegister(collector)
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}
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})
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}
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// Gets the time since the specified start in microseconds.
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func SinceInMicroseconds(start time.Time) float64 {
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return float64(time.Since(start).Nanoseconds() / time.Microsecond.Nanoseconds())
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}
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func newPodAndContainerCollector(containerCache kubecontainer.RuntimeCache) *podAndContainerCollector {
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return &podAndContainerCollector{
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containerCache: containerCache,
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}
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}
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// Custom collector for current pod and container counts.
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type podAndContainerCollector struct {
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// Cache for accessing information about running containers.
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containerCache kubecontainer.RuntimeCache
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}
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// TODO(vmarmol): Split by source?
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var (
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runningPodCountDesc = prometheus.NewDesc(
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prometheus.BuildFQName("", KubeletSubsystem, "running_pod_count"),
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"Number of pods currently running",
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nil, nil)
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runningContainerCountDesc = prometheus.NewDesc(
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prometheus.BuildFQName("", KubeletSubsystem, "running_container_count"),
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"Number of containers currently running",
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nil, nil)
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)
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func (pc *podAndContainerCollector) Describe(ch chan<- *prometheus.Desc) {
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ch <- runningPodCountDesc
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ch <- runningContainerCountDesc
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}
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func (pc *podAndContainerCollector) Collect(ch chan<- prometheus.Metric) {
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runningPods, err := pc.containerCache.GetPods()
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if err != nil {
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klog.Warningf("Failed to get running container information while collecting metrics: %v", err)
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return
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}
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runningContainers := 0
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for _, p := range runningPods {
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runningContainers += len(p.Containers)
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}
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ch <- prometheus.MustNewConstMetric(
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runningPodCountDesc,
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prometheus.GaugeValue,
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float64(len(runningPods)))
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ch <- prometheus.MustNewConstMetric(
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runningContainerCountDesc,
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prometheus.GaugeValue,
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float64(runningContainers))
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}
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const configMapAPIPathFmt = "/api/v1/namespaces/%s/configmaps/%s"
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func configLabels(source *corev1.NodeConfigSource) (map[string]string, error) {
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if source == nil {
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return map[string]string{
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// prometheus requires all of the labels that can be set on the metric
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ConfigSourceLabelKey: "local",
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ConfigUIDLabelKey: "",
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ConfigResourceVersionLabelKey: "",
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KubeletConfigKeyLabelKey: "",
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}, nil
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}
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if source.ConfigMap != nil {
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return map[string]string{
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ConfigSourceLabelKey: fmt.Sprintf(configMapAPIPathFmt, source.ConfigMap.Namespace, source.ConfigMap.Name),
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ConfigUIDLabelKey: string(source.ConfigMap.UID),
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ConfigResourceVersionLabelKey: source.ConfigMap.ResourceVersion,
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KubeletConfigKeyLabelKey: source.ConfigMap.KubeletConfigKey,
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}, nil
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}
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return nil, fmt.Errorf("unrecognized config source type, all source subfields were nil")
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}
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// track labels across metric updates, so we can delete old label sets and prevent leaks
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var assignedConfigLabels map[string]string = map[string]string{}
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func SetAssignedConfig(source *corev1.NodeConfigSource) error {
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// compute the timeseries labels from the source
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labels, err := configLabels(source)
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if err != nil {
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return err
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}
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// clean up the old timeseries (WithLabelValues creates a new one for each distinct label set)
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AssignedConfig.Delete(assignedConfigLabels)
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// record the new timeseries
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assignedConfigLabels = labels
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// expose the new timeseries with a constant count of 1
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AssignedConfig.With(assignedConfigLabels).Set(1)
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return nil
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}
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// track labels across metric updates, so we can delete old label sets and prevent leaks
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var activeConfigLabels map[string]string = map[string]string{}
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func SetActiveConfig(source *corev1.NodeConfigSource) error {
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// compute the timeseries labels from the source
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labels, err := configLabels(source)
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if err != nil {
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return err
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}
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// clean up the old timeseries (WithLabelValues creates a new one for each distinct label set)
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ActiveConfig.Delete(activeConfigLabels)
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// record the new timeseries
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activeConfigLabels = labels
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// expose the new timeseries with a constant count of 1
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ActiveConfig.With(activeConfigLabels).Set(1)
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return nil
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}
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// track labels across metric updates, so we can delete old label sets and prevent leaks
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var lastKnownGoodConfigLabels map[string]string = map[string]string{}
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func SetLastKnownGoodConfig(source *corev1.NodeConfigSource) error {
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// compute the timeseries labels from the source
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labels, err := configLabels(source)
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if err != nil {
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return err
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}
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// clean up the old timeseries (WithLabelValues creates a new one for each distinct label set)
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LastKnownGoodConfig.Delete(lastKnownGoodConfigLabels)
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// record the new timeseries
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lastKnownGoodConfigLabels = labels
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// expose the new timeseries with a constant count of 1
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LastKnownGoodConfig.With(lastKnownGoodConfigLabels).Set(1)
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return nil
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}
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func SetConfigError(err bool) {
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if err {
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ConfigError.Set(1)
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} else {
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ConfigError.Set(0)
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}
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}
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