prometheus

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// Copyright 2015 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package file
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import (
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	"github.com/prometheus/client_golang/prometheus"
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	"github.com/prometheus/prometheus/discovery"
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)
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var _ discovery.DiscovererMetrics = (*fileMetrics)(nil)
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type fileMetrics struct {
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	fileSDReadErrorsCount  prometheus.Counter
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	fileSDScanDuration     prometheus.Summary
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	fileWatcherErrorsCount prometheus.Counter
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	fileSDTimeStamp        *TimestampCollector
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	metricRegisterer discovery.MetricRegisterer
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}
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func newDiscovererMetrics(reg prometheus.Registerer, rmi discovery.RefreshMetricsInstantiator) discovery.DiscovererMetrics {
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	fm := &fileMetrics{
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		fileSDReadErrorsCount: prometheus.NewCounter(
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			prometheus.CounterOpts{
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				Name: "prometheus_sd_file_read_errors_total",
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				Help: "The number of File-SD read errors.",
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			}),
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		fileSDScanDuration: prometheus.NewSummary(
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			prometheus.SummaryOpts{
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				Name:       "prometheus_sd_file_scan_duration_seconds",
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				Help:       "The duration of the File-SD scan in seconds.",
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				Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
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			}),
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		fileWatcherErrorsCount: prometheus.NewCounter(
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			prometheus.CounterOpts{
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				Name: "prometheus_sd_file_watcher_errors_total",
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				Help: "The number of File-SD errors caused by filesystem watch failures.",
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			}),
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		fileSDTimeStamp: NewTimestampCollector(),
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	}
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	fm.metricRegisterer = discovery.NewMetricRegisterer(reg, []prometheus.Collector{
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		fm.fileSDReadErrorsCount,
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		fm.fileSDScanDuration,
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		fm.fileWatcherErrorsCount,
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		fm.fileSDTimeStamp,
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	})
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	return fm
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}
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// Register implements discovery.DiscovererMetrics.
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func (fm *fileMetrics) Register() error {
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	return fm.metricRegisterer.RegisterMetrics()
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}
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// Unregister implements discovery.DiscovererMetrics.
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func (fm *fileMetrics) Unregister() {
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	fm.metricRegisterer.UnregisterMetrics()
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}
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func (fm *fileMetrics) init(disc *Discovery) {
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	fm.fileSDTimeStamp.addDiscoverer(disc)
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}
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