metrics.go

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

     1  /*
     2  Copyright 2022 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 portallocator
    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 = "nodeport_allocator"
    29  )
    30  
    31  var (
    32  	// nodePortAllocated indicates the amount of ports allocated by NodePort Service.
    33  	nodePortAllocated = metrics.NewGauge(
    34  		&metrics.GaugeOpts{
    35  			Namespace:      namespace,
    36  			Subsystem:      subsystem,
    37  			Name:           "allocated_ports",
    38  			Help:           "Gauge measuring the number of allocated NodePorts for Services",
    39  			StabilityLevel: metrics.ALPHA,
    40  		},
    41  	)
    42  	// nodePortAvailable indicates the amount of ports available by NodePort Service.
    43  	nodePortAvailable = metrics.NewGauge(
    44  		&metrics.GaugeOpts{
    45  			Namespace:      namespace,
    46  			Subsystem:      subsystem,
    47  			Name:           "available_ports",
    48  			Help:           "Gauge measuring the number of available NodePorts for Services",
    49  			StabilityLevel: metrics.ALPHA,
    50  		},
    51  	)
    52  	// nodePortAllocation counts the total number of ports allocation and allocation mode: static or dynamic.
    53  	nodePortAllocations = metrics.NewCounterVec(
    54  		&metrics.CounterOpts{
    55  			Namespace:      namespace,
    56  			Subsystem:      subsystem,
    57  			Name:           "allocation_total",
    58  			Help:           "Number of NodePort allocations",
    59  			StabilityLevel: metrics.ALPHA,
    60  		},
    61  		[]string{"scope"},
    62  	)
    63  	// nodePortAllocationErrors counts the number of error trying to allocate a nodePort and allocation mode: static or dynamic.
    64  	nodePortAllocationErrors = metrics.NewCounterVec(
    65  		&metrics.CounterOpts{
    66  			Namespace:      namespace,
    67  			Subsystem:      subsystem,
    68  			Name:           "allocation_errors_total",
    69  			Help:           "Number of errors trying to allocate NodePort",
    70  			StabilityLevel: metrics.ALPHA,
    71  		},
    72  		[]string{"scope"},
    73  	)
    74  )
    75  
    76  var registerMetricsOnce sync.Once
    77  
    78  func registerMetrics() {
    79  	registerMetricsOnce.Do(func() {
    80  		legacyregistry.MustRegister(nodePortAllocated)
    81  		legacyregistry.MustRegister(nodePortAvailable)
    82  		legacyregistry.MustRegister(nodePortAllocations)
    83  		legacyregistry.MustRegister(nodePortAllocationErrors)
    84  	})
    85  }
    86  
    87  // metricsRecorderInterface is the interface to record metrics.
    88  type metricsRecorderInterface interface {
    89  	setAllocated(allocated int)
    90  	setAvailable(available int)
    91  	incrementAllocations(scope string)
    92  	incrementAllocationErrors(scope string)
    93  }
    94  
    95  // metricsRecorder implements metricsRecorderInterface.
    96  type metricsRecorder struct{}
    97  
    98  func (m *metricsRecorder) setAllocated(allocated int) {
    99  	nodePortAllocated.Set(float64(allocated))
   100  }
   101  
   102  func (m *metricsRecorder) setAvailable(available int) {
   103  	nodePortAvailable.Set(float64(available))
   104  }
   105  
   106  func (m *metricsRecorder) incrementAllocations(scope string) {
   107  	nodePortAllocations.WithLabelValues(scope).Inc()
   108  }
   109  
   110  func (m *metricsRecorder) incrementAllocationErrors(scope string) {
   111  	nodePortAllocationErrors.WithLabelValues(scope).Inc()
   112  }
   113  
   114  // emptyMetricsRecorder is a null object implements metricsRecorderInterface.
   115  type emptyMetricsRecorder struct{}
   116  
   117  func (*emptyMetricsRecorder) setAllocated(allocated int)             {}
   118  func (*emptyMetricsRecorder) setAvailable(available int)             {}
   119  func (*emptyMetricsRecorder) incrementAllocations(scope string)      {}
   120  func (*emptyMetricsRecorder) incrementAllocationErrors(scope string) {}
   121
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