frostfs-http-gw/metrics/desc.go
Marina Biryukova dbc6804d27
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[#77] Add metrics for HTTP endpoint status
Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>
2023-08-31 14:52:37 +03:00

150 lines
4.3 KiB
Go

package metrics
import (
"encoding/json"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
)
var appMetricsDesc = map[string]map[string]Description{
poolSubsystem: {
overallErrorsMetric: Description{
Type: dto.MetricType_GAUGE,
Namespace: namespace,
Subsystem: poolSubsystem,
Name: overallErrorsMetric,
Help: "Total number of errors in pool",
},
overallNodeErrorsMetric: Description{
Type: dto.MetricType_GAUGE,
Namespace: namespace,
Subsystem: poolSubsystem,
Name: overallNodeErrorsMetric,
Help: "Total number of errors for connection in pool",
VariableLabels: []string{"node"},
},
overallNodeRequestsMetric: Description{
Type: dto.MetricType_GAUGE,
Namespace: namespace,
Subsystem: poolSubsystem,
Name: overallNodeRequestsMetric,
Help: "Total number of requests to specific node in pool",
VariableLabels: []string{"node"},
},
currentErrorMetric: Description{
Type: dto.MetricType_GAUGE,
Namespace: namespace,
Subsystem: poolSubsystem,
Name: currentErrorMetric,
Help: "Number of errors on current connections that will be reset after the threshold",
VariableLabels: []string{"node"},
},
avgRequestDurationMetric: Description{
Type: dto.MetricType_GAUGE,
Namespace: namespace,
Subsystem: poolSubsystem,
Name: avgRequestDurationMetric,
Help: "Average request duration (in milliseconds) for specific method on node in pool",
VariableLabels: []string{"node", "method"},
},
},
stateSubsystem: {
healthMetric: Description{
Type: dto.MetricType_GAUGE,
Namespace: namespace,
Subsystem: stateSubsystem,
Name: healthMetric,
Help: "Current HTTP gateway state",
},
versionInfoMetric: Description{
Type: dto.MetricType_GAUGE,
Namespace: namespace,
Subsystem: stateSubsystem,
Name: versionInfoMetric,
Help: "Version of current FrostFS HTTP Gate instance",
VariableLabels: []string{"version"},
},
},
serverSubsystem: {
healthMetric: Description{
Type: dto.MetricType_GAUGE,
Namespace: namespace,
Subsystem: serverSubsystem,
Name: healthMetric,
Help: "HTTP Server endpoint health",
VariableLabels: []string{"endpoint"},
},
},
}
type Description struct {
Type dto.MetricType
Namespace string
Subsystem string
Name string
Help string
ConstantLabels prometheus.Labels
VariableLabels []string
}
func (d *Description) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
Type string `json:"type"`
FQName string `json:"name"`
Help string `json:"help"`
ConstantLabels prometheus.Labels `json:"constant_labels,omitempty"`
VariableLabels []string `json:"variable_labels,omitempty"`
}{
Type: d.Type.String(),
FQName: d.BuildFQName(),
Help: d.Help,
ConstantLabels: d.ConstantLabels,
VariableLabels: d.VariableLabels,
})
}
func (d *Description) BuildFQName() string {
return prometheus.BuildFQName(d.Namespace, d.Subsystem, d.Name)
}
// DescribeAll returns descriptions for metrics.
func DescribeAll() []Description {
var list []Description
for _, m := range appMetricsDesc {
for _, description := range m {
list = append(list, description)
}
}
return list
}
func newOpts(description Description) prometheus.Opts {
return prometheus.Opts{
Namespace: description.Namespace,
Subsystem: description.Subsystem,
Name: description.Name,
Help: description.Help,
ConstLabels: description.ConstantLabels,
}
}
func mustNewGauge(description Description) prometheus.Gauge {
if description.Type != dto.MetricType_GAUGE {
panic("invalid metric type")
}
return prometheus.NewGauge(
prometheus.GaugeOpts(newOpts(description)),
)
}
func mustNewGaugeVec(description Description) *prometheus.GaugeVec {
if description.Type != dto.MetricType_GAUGE {
panic("invalid metric type")
}
return prometheus.NewGaugeVec(
prometheus.GaugeOpts(newOpts(description)),
description.VariableLabels,
)
}