/
interface.go
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/
interface.go
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// Copyright (c) 2021 The Jaeger Authors.
//
// Licensed 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 metricsstore
import (
"context"
"time"
"github.com/jaegertracing/jaeger/proto-gen/api_v2/metrics"
)
// Reader can load aggregated trace metrics from storage.
type Reader interface {
// GetLatencies gets the latency metrics for a specific quantile (e.g. 0.99) and list of services
// grouped by service and optionally grouped by operation.
GetLatencies(ctx context.Context, params *LatenciesQueryParameters) (*metrics.MetricFamily, error)
// GetCallRates gets the call rate metrics for a given list of services grouped by service
// and optionally grouped by operation.
GetCallRates(ctx context.Context, params *CallRateQueryParameters) (*metrics.MetricFamily, error)
// GetErrorRates gets the error rate metrics for a given list of services grouped by service
// and optionally grouped by operation.
GetErrorRates(ctx context.Context, params *ErrorRateQueryParameters) (*metrics.MetricFamily, error)
// GetMinStepDuration gets the min time resolution supported by the backing metrics store,
// e.g. 10s means the backend can only return data points that are at least 10s apart, not closer.
GetMinStepDuration(ctx context.Context, params *MinStepDurationQueryParameters) (time.Duration, error)
}
// BaseQueryParameters contains the common set of parameters used by all metrics queries:
// latency, call rate or error rate.
type BaseQueryParameters struct {
// ServiceNames are the service names to fetch metrics from. The results will be grouped by service_name.
ServiceNames []string
// GroupByOperation determines if the metrics returned should be grouped by operation.
GroupByOperation bool
// EndTime is the ending time of the time series query range.
EndTime *time.Time
// Lookback is the duration from the end_time to look back on for metrics data points.
// For example, if set to 1h, the query would span from end_time-1h to end_time.
Lookback *time.Duration
// Step size is the duration between data points of the query results.
// For example, if set to 5s, the results would produce a data point every 5 seconds from the (EndTime - Lookback) to EndTime.
Step *time.Duration
// RatePer is the duration in which the per-second rate of change is calculated for a cumulative counter metric.
RatePer *time.Duration
// SpanKinds is the list of span kinds to include (logical OR) in the resulting metrics aggregation.
SpanKinds []string
}
// LatenciesQueryParameters contains the parameters required for latency metrics queries.
type LatenciesQueryParameters struct {
BaseQueryParameters
// Quantile is the quantile to compute from latency histogram metrics.
// Valid range: 0 - 1 (inclusive).
//
// e.g. 0.99 will return the 99th percentile or P99 which is the worst latency
// observed from 99% of all spans for the given service (and operation).
Quantile float64
}
// CallRateQueryParameters contains the parameters required for call rate metrics queries.
type CallRateQueryParameters struct {
BaseQueryParameters
}
// ErrorRateQueryParameters contains the parameters required for error rate metrics queries.
type ErrorRateQueryParameters struct {
BaseQueryParameters
}
// MinStepDurationQueryParameters contains the parameters required for fetching the minimum step duration.
type MinStepDurationQueryParameters struct{}