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state_node.go
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state_node.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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.
package state_node
import (
"github.com/pkg/errors"
"github.com/elastic/beats/libbeat/common/kubernetes"
p "github.com/elastic/beats/metricbeat/helper/prometheus"
"github.com/elastic/beats/metricbeat/mb"
"github.com/elastic/beats/metricbeat/mb/parse"
"github.com/elastic/beats/metricbeat/module/kubernetes/util"
)
const (
defaultScheme = "http"
defaultPath = "/metrics"
)
var (
hostParser = parse.URLHostParserBuilder{
DefaultScheme: defaultScheme,
DefaultPath: defaultPath,
}.Build()
mapping = &p.MetricsMapping{
Metrics: map[string]p.MetricMap{
"kube_node_info": p.InfoMetric(),
"kube_node_status_allocatable_pods": p.Metric("pod.allocatable.total"),
"kube_node_status_capacity_pods": p.Metric("pod.capacity.total"),
"kube_node_status_capacity_memory_bytes": p.Metric("memory.capacity.bytes"),
"kube_node_status_allocatable_memory_bytes": p.Metric("memory.allocatable.bytes"),
"kube_node_status_capacity_cpu_cores": p.Metric("cpu.capacity.cores"),
"kube_node_status_allocatable_cpu_cores": p.Metric("cpu.allocatable.cores"),
"kube_node_spec_unschedulable": p.BooleanMetric("status.unschedulable"),
"kube_node_status_ready": p.LabelMetric("status.ready", "condition"),
"kube_node_status_condition": p.LabelMetric("status.ready", "status",
p.OpFilter(map[string]string{
"condition": "Ready",
})),
},
Labels: map[string]p.LabelMap{
"node": p.KeyLabel("name"),
},
}
)
// init registers the MetricSet with the central registry.
// The New method will be called after the setup of the module and before starting to fetch data
func init() {
if err := mb.Registry.AddMetricSet("kubernetes", "state_node", New, hostParser); err != nil {
panic(err)
}
}
// MetricSet type defines all fields of the MetricSet
// As a minimum it must inherit the mb.BaseMetricSet fields, but can be extended with
// additional entries. These variables can be used to persist data or configuration between
// multiple fetch calls.
type MetricSet struct {
mb.BaseMetricSet
prometheus p.Prometheus
enricher util.Enricher
}
// New create a new instance of the MetricSet
// Part of new is also setting up the configuration by processing additional
// configuration entries if needed.
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
prometheus, err := p.NewPrometheusClient(base)
if err != nil {
return nil, err
}
return &MetricSet{
BaseMetricSet: base,
prometheus: prometheus,
enricher: util.NewResourceMetadataEnricher(base, &kubernetes.Node{}, false),
}, nil
}
// Fetch methods implements the data gathering and data conversion to the right
// format. It publishes the event which is then forwarded to the output. In case
// of an error set the Error field of mb.Event or simply call report.Error().
func (m *MetricSet) Fetch(reporter mb.ReporterV2) error {
m.enricher.Start()
events, err := m.prometheus.GetProcessedMetrics(mapping)
if err != nil {
return errors.Wrap(err, "error doing HTTP request to fetch 'state_node' Metricset data")
}
m.enricher.Enrich(events)
for _, event := range events {
event[mb.NamespaceKey] = "node"
reported := reporter.Event(mb.TransformMapStrToEvent("kubernetes", event, nil))
if !reported {
return nil
}
}
return nil
}
// Close stops this metricset
func (m *MetricSet) Close() error {
m.enricher.Stop()
return nil
}