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stats_reporter.go
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/
stats_reporter.go
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package audit
import (
"context"
"sync"
"time"
"github.com/open-policy-agent/gatekeeper/v3/pkg/metrics/exporters/view"
"github.com/open-policy-agent/gatekeeper/v3/pkg/util"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric"
sdkmetric "go.opentelemetry.io/otel/sdk/metric"
)
const (
violationsMetricName = "violations"
auditDurationMetricName = "audit_duration_seconds"
lastRunStartTimeMetricName = "audit_last_run_time"
lastRunEndTimeMetricName = "audit_last_run_end_time"
enforcementActionKey = "enforcement_action"
)
var auditDurationM metric.Float64Histogram
func init() {
view.Register(sdkmetric.NewView(
sdkmetric.Instrument{Name: auditDurationMetricName},
sdkmetric.Stream{
Aggregation: sdkmetric.AggregationExplicitBucketHistogram{
Boundaries: []float64{1 * 60, 3 * 60, 5 * 60, 10 * 60, 15 * 60, 20 * 60, 40 * 60, 80 * 60, 160 * 60, 320 * 60},
},
},
))
}
func (r *reporter) observeTotalViolations(_ context.Context, o metric.Int64Observer) error {
r.mu.RLock()
defer r.mu.RUnlock()
for k, v := range r.totalViolationsPerEnforcementAction {
o.Observe(v, metric.WithAttributes(attribute.String(enforcementActionKey, string(k))))
}
return nil
}
func (r *reporter) reportTotalViolations(enforcementAction util.EnforcementAction, v int64) error {
r.mu.Lock()
defer r.mu.Unlock()
if r.totalViolationsPerEnforcementAction == nil {
r.totalViolationsPerEnforcementAction = make(map[util.EnforcementAction]int64)
}
r.totalViolationsPerEnforcementAction[enforcementAction] = v
return nil
}
func (r *reporter) reportRunStart(t time.Time) error {
r.mu.Lock()
defer r.mu.Unlock()
r.startTime = t
return nil
}
func (r *reporter) reportLatency(d time.Duration) error {
auditDurationM.Record(context.Background(), d.Seconds())
return nil
}
func (r *reporter) reportRunEnd(t time.Time) error {
r.mu.Lock()
defer r.mu.Unlock()
r.endTime = t
return nil
}
func (r *reporter) observeRunStart(_ context.Context, o metric.Float64Observer) error {
r.mu.RLock()
defer r.mu.RUnlock()
o.Observe(float64(r.startTime.Unix()))
return nil
}
func (r *reporter) observeRunEnd(_ context.Context, o metric.Float64Observer) error {
r.mu.RLock()
defer r.mu.RUnlock()
o.Observe(float64(r.endTime.Unix()))
return nil
}
// newStatsReporter creates a reporter for audit metrics.
func newStatsReporter() (*reporter, error) {
r := &reporter{}
var err error
meter := otel.GetMeterProvider().Meter("gatekeeper")
_, err = meter.Int64ObservableGauge(
violationsMetricName,
metric.WithDescription("Total number of audited violations"),
metric.WithInt64Callback(r.observeTotalViolations),
)
if err != nil {
return nil, err
}
auditDurationM, err = meter.Float64Histogram(
auditDurationMetricName,
metric.WithDescription("Latency of audit operation in seconds"))
if err != nil {
return nil, err
}
_, err = meter.Float64ObservableGauge(
lastRunStartTimeMetricName,
metric.WithDescription("Timestamp of last audit run starting time"),
metric.WithFloat64Callback(r.observeRunStart),
)
if err != nil {
return nil, err
}
_, err = meter.Float64ObservableGauge(
lastRunEndTimeMetricName,
metric.WithDescription("Timestamp of last audit run ending time"),
metric.WithFloat64Callback(r.observeRunEnd),
)
if err != nil {
return nil, err
}
return r, nil
}
type reporter struct {
mu sync.RWMutex
endTime time.Time
startTime time.Time
totalViolationsPerEnforcementAction map[util.EnforcementAction]int64
}