# OTLPファイルエクスポーター > Source: https://www.ymotongpoo.com/works/otel-specs-ja/spec/protocol/file-exporter/ **ステータス**: [Development](/works/otel-specs-ja/spec/document-status/) このドキュメントは、ファイルまたはstdoutのいずれかへエクスポートできるOTLPエクスポーターを規定するためのプレースホルダーです。 現時点では、OpenTelemetryデータのOTLP JSON形式へのシリアライズのみを説明します。 ## ユースケース なぜファイルエクスポーターが必要なのでしょうか。OTLPエクスポーターをそのまま使わない理由は何でしょうか。 - **FaaS**：FaaS環境では、OTLPエクスポーターがCollectorへデータを送信できない場合があります。 - **Podからの一貫したログスクレイピング**：Kubernetes環境では、ログはPodのstdoutファイルからスクレイピングされることがよくあります。このエクスポーターを使ってログをstdoutへ書き込めば、既存のログスクレイピングツールとの連携が容易になります。既存の解決策は、トレースIDのようなメタデータをログ行に追加しますが、これには手動での設定が必要で、しかも誤りが発生しやすくなります。 - **信頼性**：信頼性の観点から、データをネットワーク経由で送信するよりもファイルへログを書き込むことを好む場合があります。 ## エクスポーターの設定 メトリクスエクスポーターは、[OTLPエクスポーター](/works/otel-specs-ja/spec/metrics/sdk_exporters/otlp/#追加の環境変数設定)仕様書で定義されている環境変数をMUSTサポートするものとします。 言語が、関連するエクスポーターと組み合わせるスパンプロセッサーまたはログプロセッサーを自動的に設定する仕組み（例えば[`OTEL_TRACES_EXPORTER`環境変数](/works/otel-specs-ja/spec/configuration/sdk-environment-variables/#エクスポーターの選択)を使うなど）を提供している場合、デフォルトではOTLPファイルエクスポーターはバッチ処理を行うプロセッサーと組み合わされるべきです（SHOULD）。 ### プログラマティックな設定 | 要求レベル | 名前 | 説明 | デフォルト | |-------------|----------------------------|--------------------------------------------------------------------------------------------------------|---------| | MUST | 出力ストリーム（またはそれに類するもの） | 出力ストリームを設定します。出力ストリームをファイルに設定できる可能性をSHOULD含めるものとします。 | stdout | ## JSONファイルのシリアライズ このドキュメントは、ファイルに保存できるJSONオブジェクトとしてOpenTelemetryデータをシリアライズする方法を説明します。 ### ファイルストレージの要求事項 #### JSON lines形式のファイル このファイルは[JSON lines形式のファイル](https://jsonlines.org)であり、したがって以下の要求事項に従います。 * UTF-8エンコーディング * 各行が有効なJSONの値である * 行区切り文字は`\n`である * 推奨されるファイル拡張子は`jsonl`である #### ストリーミングでの追記 ファイル内のデータが順序付けされている保証はありません。 タイムスタンプが単調に増加する保証も特にありません。 ### テレメトリーデータの要求事項 このセクションでは、シリアライズ方式の最初のバージョンを定義します。 データは、[OTLP JSONエンコーディング](/works/otel-specs-ja/otlp/specification/#json-protobufエンコーディング)で規定されている形式に従ってエンコードしなければなりません（MUST）。 トップレベルのオブジェクトとしては、`TracesData`、`MetricsData`、`LogsData`のみがサポートされます。 ファイルは、トレース、メトリクス、ログのいずれか1種類のデータのみを含まなければなりません（MUST）。 ### 例 以下は、トレースを示す例です。 ```json lines {"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000000123","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000000123","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":4},{"traceId":"","spanId":"","droppedAttributesCount":1}],"droppedLinksCount":3,"status":{}}]}]}]} {"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000000424","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000000424","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000000343","endTimeUnixNano":"1581452773000001089","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":3},{"traceId":"","spanId":"","droppedAttributesCount":4}],"droppedLinksCount":2,"status":{}}]}]}]} {"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000000826","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000000826","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000200521","endTimeUnixNano":"1581452773000004789","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":5},{"traceId":"","spanId":"","droppedAttributesCount":2}],"droppedLinksCount":3,"status":{}}]}]}]} {"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000010925","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000010925","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000011821","endTimeUnixNano":"1581452772000012924","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":2},{"traceId":"","spanId":"","droppedAttributesCount":2}],"droppedLinksCount":5,"status":{}}]}]}]} ``` 以下は、メトリクスを示す例です。 ```json lines {"resourceMetrics":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeMetrics":[{"scope":{},"metrics":[{"name":"counter-int","unit":"1","sum":{"dataPoints":[{"attributes":[{"key":"label-1","value":{"stringValue":"label-value-1"}}],"startTimeUnixNano":"1581452773000000789","timeUnixNano":"1581452773000000789","asInt":"123"},{"attributes":[{"key":"label-2","value":{"stringValue":"label-value-2"}}],"startTimeUnixNano":"1581452772000000321","timeUnixNano":"1581452773000000789","asInt":"456"}],"aggregationTemporality":2,"isMonotonic":true}},{"name":"counter-int","unit":"1","sum":{"dataPoints":[{"attributes":[{"key":"label-1","value":{"stringValue":"label-value-1"}}],"startTimeUnixNano":"1581452772000000321","timeUnixNano":"1581452773000000789","asInt":"123"},{"attributes":[{"key":"label-2","value":{"stringValue":"label-value-2"}}],"startTimeUnixNano":"1581452772000000321","timeUnixNano":"1581452773000000789","asInt":"456"}],"aggregationTemporality":2,"isMonotonic":true}}]}]}]} {"resourceMetrics":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeMetrics":[{"scope":{},"metrics":[{"name":"counter-int","unit":"1","sum":{"dataPoints":[{"attributes":[{"key":"label-1","value":{"stringValue":"label-value-1"}}],"startTimeUnixNano":"1581452773000001459","timeUnixNano":"1581452773000001459","asInt":"120"},{"attributes":[{"key":"label-2","value":{"stringValue":"label-value-2"}}],"startTimeUnixNano":"1581452773000001459","timeUnixNano":"1581452773000001459","asInt":"456"}],"aggregationTemporality":2,"isMonotonic":true}},{"name":"counter-int","unit":"1","sum":{"dataPoints":[{"attributes":[{"key":"label-1","value":{"stringValue":"label-value-1"}}],"startTimeUnixNano":"1581452773000001459","timeUnixNano":"1581452773000001459","asInt":"123"},{"attributes":[{"key":"label-2","value":{"stringValue":"label-value-2"}}],"startTimeUnixNano":"1581452773000001459","timeUnixNano":"1581452773000001459","asInt":"456"}],"aggregationTemporality":2,"isMonotonic":true}}]}]}]} {"resourceMetrics":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeMetrics":[{"scope":{},"metrics":[{"name":"counter-int","unit":"1","sum":{"dataPoints":[{"attributes":[{"key":"label-1","value":{"stringValue":"label-value-1"}}],"startTimeUnixNano":"1581452773000002346","timeUnixNano":"1581452773000002346","asInt":"121"},{"attributes":[{"key":"label-2","value":{"stringValue":"label-value-2"}}],"startTimeUnixNano":"1581452773000002346","timeUnixNano":"1581452773000002346","asInt":"456"}],"aggregationTemporality":2,"isMonotonic":true}},{"name":"counter-int","unit":"1","sum":{"dataPoints":[{"attributes":[{"key":"label-1","value":{"stringValue":"label-value-1"}}],"startTimeUnixNano":"1581452773000002346","timeUnixNano":"1581452773000002346","asInt":"123"},{"attributes":[{"key":"label-2","value":{"stringValue":"label-value-2"}}],"startTimeUnixNano":"1581452772000000321","timeUnixNano":"1581452773000000789","asInt":"456"}],"aggregationTemporality":2,"isMonotonic":true}}]}]}]} {"resourceMetrics":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeMetrics":[{"scope":{},"metrics":[{"name":"counter-int","unit":"1","sum":{"dataPoints":[{"attributes":[{"key":"label-1","value":{"stringValue":"label-value-1"}}],"startTimeUnixNano":"1581452773000007891","timeUnixNano":"1581452773000007891","asInt":"125"},{"attributes":[{"key":"label-2","value":{"stringValue":"label-value-2"}}],"startTimeUnixNano":"1581452772000000321","timeUnixNano":"1581452773000007891","asInt":"456"}],"aggregationTemporality":2,"isMonotonic":true}},{"name":"counter-int","unit":"1","sum":{"dataPoints":[{"attributes":[{"key":"label-1","value":{"stringValue":"label-value-1"}}],"startTimeUnixNano":"1581452773000007891","timeUnixNano":"1581452773000007891","asInt":"123"},{"attributes":[{"key":"label-2","value":{"stringValue":"label-value-2"}}],"startTimeUnixNano":"1581452772000000321","timeUnixNano":"1581452773000007891","asInt":"456"}],"aggregationTemporality":2,"isMonotonic":true}}]}]}]} ``` 以下は、ログを示す例です。 ```json lines {"resourceLogs":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeLogs":[{"scope":{},"logRecords":[{"timeUnixNano":"1581452773000000789","severityNumber":9,"severityText":"Info","body":{"stringValue":"This is a log message"},"attributes":[{"key":"app","value":{"stringValue":"server"}},{"key":"instance_num","value":{"intValue":"1"}}],"droppedAttributesCount":1,"traceId":"08040201000000000000000000000000","spanId":"0102040800000000"},{"timeUnixNano":"1581452773000000789","severityNumber":9,"severityText":"Info","body":{"stringValue":"something happened"},"attributes":[{"key":"customer","value":{"stringValue":"acme"}},{"key":"env","value":{"stringValue":"dev"}}],"droppedAttributesCount":1,"traceId":"","spanId":""}]}]}]} {"resourceLogs":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeLogs":[{"scope":{},"logRecords":[{"timeUnixNano":"1581452773000001233","severityNumber":9,"severityText":"Info","body":{"stringValue":"This is a log message"},"attributes":[{"key":"app","value":{"stringValue":"server"}},{"key":"instance_num","value":{"intValue":"1"}}],"droppedAttributesCount":1,"traceId":"08040201000000000000000000000000","spanId":"0102040800000000"},{"timeUnixNano":"1581452773000000789","severityNumber":9,"severityText":"Info","body":{"stringValue":"something happened"},"attributes":[{"key":"customer","value":{"stringValue":"acme"}},{"key":"env","value":{"stringValue":"dev"}}],"droppedAttributesCount":1,"traceId":"","spanId":""}]}]}]} {"resourceLogs":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeLogs":[{"scope":{},"logRecords":[{"timeUnixNano":"1581452773000005443","severityNumber":9,"severityText":"Info","body":{"stringValue":"This is a log message"},"attributes":[{"key":"app","value":{"stringValue":"server"}},{"key":"instance_num","value":{"intValue":"1"}}],"droppedAttributesCount":1,"traceId":"08040201000000000000000000000000","spanId":"0102040800000000"},{"timeUnixNano":"1581452773000000789","severityNumber":9,"severityText":"Info","body":{"stringValue":"something happened"},"attributes":[{"key":"customer","value":{"stringValue":"acme"}},{"key":"env","value":{"stringValue":"dev"}}],"droppedAttributesCount":1,"traceId":"","spanId":""}]}]}]} {"resourceLogs":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeLogs":[{"scope":{},"logRecords":[{"timeUnixNano":"1581452773000009875","severityNumber":9,"severityText":"Info","body":{"stringValue":"This is a log message"},"attributes":[{"key":"app","value":{"stringValue":"server"}},{"key":"instance_num","value":{"intValue":"1"}}],"droppedAttributesCount":1,"traceId":"08040201000000000000000000000000","spanId":"0102040800000000"},{"timeUnixNano":"1581452773000000789","severityNumber":9,"severityText":"Info","body":{"stringValue":"something happened"},"attributes":[{"key":"customer","value":{"stringValue":"acme"}},{"key":"env","value":{"stringValue":"dev"}}],"droppedAttributesCount":1,"traceId":"","spanId":""}]}]}]} ```