metrics.go

Documentation: k8s.io/kubernetes/pkg/registry/core/service/ipallocator

     1  /*
     2  Copyright 2021 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package ipallocator
    18  
    19  import (
    20  	"sync"
    21  
    22  	"k8s.io/component-base/metrics"
    23  	"k8s.io/component-base/metrics/legacyregistry"
    24  )
    25  
    26  const (
    27  	namespace = "kube_apiserver"
    28  	subsystem = "clusterip_allocator"
    29  )
    30  
    31  var (
    32  	// clusterIPAllocated indicates the amount of cluster IP allocated by Service CIDR.
    33  	clusterIPAllocated = metrics.NewGaugeVec(
    34  		&metrics.GaugeOpts{
    35  			Namespace:      namespace,
    36  			Subsystem:      subsystem,
    37  			Name:           "allocated_ips",
    38  			Help:           "Gauge measuring the number of allocated IPs for Services",
    39  			StabilityLevel: metrics.ALPHA,
    40  		},
    41  		[]string{"cidr"},
    42  	)
    43  	// clusterIPAvailable indicates the amount of cluster IP available by Service CIDR.
    44  	clusterIPAvailable = metrics.NewGaugeVec(
    45  		&metrics.GaugeOpts{
    46  			Namespace:      namespace,
    47  			Subsystem:      subsystem,
    48  			Name:           "available_ips",
    49  			Help:           "Gauge measuring the number of available IPs for Services",
    50  			StabilityLevel: metrics.ALPHA,
    51  		},
    52  		[]string{"cidr"},
    53  	)
    54  	// clusterIPAllocation counts the total number of ClusterIP allocation and allocation mode: static or dynamic.
    55  	clusterIPAllocations = metrics.NewCounterVec(
    56  		&metrics.CounterOpts{
    57  			Namespace:      namespace,
    58  			Subsystem:      subsystem,
    59  			Name:           "allocation_total",
    60  			Help:           "Number of Cluster IPs allocations",
    61  			StabilityLevel: metrics.ALPHA,
    62  		},
    63  		[]string{"cidr", "scope"},
    64  	)
    65  	// clusterIPAllocationErrors counts the number of error trying to allocate a ClusterIP and allocation mode: static or dynamic.
    66  	clusterIPAllocationErrors = metrics.NewCounterVec(
    67  		&metrics.CounterOpts{
    68  			Namespace:      namespace,
    69  			Subsystem:      subsystem,
    70  			Name:           "allocation_errors_total",
    71  			Help:           "Number of errors trying to allocate Cluster IPs",
    72  			StabilityLevel: metrics.ALPHA,
    73  		},
    74  		[]string{"cidr", "scope"},
    75  	)
    76  )
    77  
    78  var registerMetricsOnce sync.Once
    79  
    80  func registerMetrics() {
    81  	registerMetricsOnce.Do(func() {
    82  		legacyregistry.MustRegister(clusterIPAllocated)
    83  		legacyregistry.MustRegister(clusterIPAvailable)
    84  		legacyregistry.MustRegister(clusterIPAllocations)
    85  		legacyregistry.MustRegister(clusterIPAllocationErrors)
    86  	})
    87  }
    88  
    89  // metricsRecorderInterface is the interface to record metrics.
    90  type metricsRecorderInterface interface {
    91  	setAllocated(cidr string, allocated int)
    92  	setAvailable(cidr string, available int)
    93  	incrementAllocations(cidr, scope string)
    94  	incrementAllocationErrors(cidr, scope string)
    95  }
    96  
    97  // metricsRecorder implements metricsRecorderInterface.
    98  type metricsRecorder struct{}
    99  
   100  func (m *metricsRecorder) setAllocated(cidr string, allocated int) {
   101  	clusterIPAllocated.WithLabelValues(cidr).Set(float64(allocated))
   102  }
   103  
   104  func (m *metricsRecorder) setAvailable(cidr string, available int) {
   105  	clusterIPAvailable.WithLabelValues(cidr).Set(float64(available))
   106  }
   107  
   108  func (m *metricsRecorder) incrementAllocations(cidr, scope string) {
   109  	clusterIPAllocations.WithLabelValues(cidr, scope).Inc()
   110  }
   111  
   112  func (m *metricsRecorder) incrementAllocationErrors(cidr, scope string) {
   113  	clusterIPAllocationErrors.WithLabelValues(cidr, scope).Inc()
   114  }
   115  
   116  // emptyMetricsRecorder is a null object implements metricsRecorderInterface.
   117  type emptyMetricsRecorder struct{}
   118  
   119  func (*emptyMetricsRecorder) setAllocated(cidr string, allocated int)      {}
   120  func (*emptyMetricsRecorder) setAvailable(cidr string, available int)      {}
   121  func (*emptyMetricsRecorder) incrementAllocations(cidr, scope string)      {}
   122  func (*emptyMetricsRecorder) incrementAllocationErrors(cidr, scope string) {}
   123
View as plain text