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95 changes: 95 additions & 0 deletions
95
processor/probabilisticsamplerprocessor/logprobabilisticsampler.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // Copyright The OpenTelemetry 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. | ||
|
|
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| package probabilisticsamplerprocessor // import "github.com/open-telemetry/opentelemetry-collector-contrib/processor/probabilisticsamplerprocessor" | ||
|
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| import ( | ||
| "context" | ||
| "sort" | ||
|
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| "go.opentelemetry.io/collector/component" | ||
| "go.opentelemetry.io/collector/consumer" | ||
| "go.opentelemetry.io/collector/model/pdata" | ||
| "go.opentelemetry.io/collector/processor/processorhelper" | ||
| ) | ||
|
|
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| type severitySamplingRate struct { | ||
| level pdata.SeverityNumber | ||
| scaledSamplingRate uint32 | ||
| } | ||
|
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| type logsamplerprocessor struct { | ||
| samplingRates []*severitySamplingRate | ||
| hashSeed uint32 | ||
| } | ||
|
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| // newLogsProcessor returns a processor.LogsProcessor that will perform head sampling according to the given | ||
| // configuration. | ||
| func newLogsProcessor(nextConsumer consumer.Logs, cfg *Config) (component.LogsProcessor, error) { | ||
|
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| severitySamplingRates := []*severitySamplingRate{ | ||
| {level: pdata.SeverityNumberUNDEFINED, scaledSamplingRate: uint32(cfg.SamplingPercentage * percentageScaleFactor)}, | ||
| } | ||
| sort.SliceStable(cfg.Severity, func(i, j int) bool { | ||
| return severityTextToNum[cfg.Severity[i].Level] < severityTextToNum[cfg.Severity[j].Level] | ||
| }) | ||
| for _, pair := range cfg.Severity { | ||
| newRate := &severitySamplingRate{level: severityTextToNum[pair.Level], | ||
| scaledSamplingRate: uint32(pair.SamplingPercentage * percentageScaleFactor), | ||
| } | ||
| severitySamplingRates = append(severitySamplingRates, newRate) | ||
| } | ||
|
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| lsp := &logsamplerprocessor{ | ||
| samplingRates: severitySamplingRates, | ||
| hashSeed: cfg.HashSeed, | ||
| } | ||
|
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| return processorhelper.NewLogsProcessor( | ||
| cfg, | ||
| nextConsumer, | ||
| lsp.processLogs, | ||
| processorhelper.WithCapabilities(consumer.Capabilities{MutatesData: true})) | ||
| } | ||
|
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| func (lsp *logsamplerprocessor) processLogs(_ context.Context, ld pdata.Logs) (pdata.Logs, error) { | ||
| ld.ResourceLogs().RemoveIf(func(rl pdata.ResourceLogs) bool { | ||
| rl.ScopeLogs().RemoveIf(func(ill pdata.ScopeLogs) bool { | ||
| ill.LogRecords().RemoveIf(func(l pdata.LogRecord) bool { | ||
|
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| // find the correct severity sampling level. | ||
| var selectedSamplingRate *severitySamplingRate | ||
| for _, ssr := range lsp.samplingRates { | ||
| if ssr.level > l.SeverityNumber() { | ||
| break | ||
| } | ||
| selectedSamplingRate = ssr | ||
| } | ||
|
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| // Create an id for the log record by combining the timestamp and severity text. | ||
| lidBytes := []byte(l.Timestamp().String() + l.SeverityText()) | ||
| sampled := hash(lidBytes[:], lsp.hashSeed)&bitMaskHashBuckets < selectedSamplingRate.scaledSamplingRate | ||
| return !sampled | ||
| }) | ||
| // Filter out empty ScopeLogs | ||
| return ill.LogRecords().Len() == 0 | ||
| }) | ||
| // Filter out empty ResourceLogs | ||
| return rl.ScopeLogs().Len() == 0 | ||
| }) | ||
| if ld.ResourceLogs().Len() == 0 { | ||
| return ld, processorhelper.ErrSkipProcessingData | ||
| } | ||
| return ld, nil | ||
| } |
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