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JsonlTraceExporter.Builder.append(boolean append)
Appends to existing file if present (default: true).
Enables exactly these event types (chunk and summary helpers still apply).
JsonlTraceExporter.Builder.failFast(boolean failFast)
If enabled, exporter errors fail the agent execution (default: false, best-effort).
Flushes after each JSONL line (default: true).
Includes tool streaming events (ActingChunkEvent).
Includes reasoning streaming events (ReasoningChunkEvent).
Includes summary events (PreSummaryEvent/PostSummaryEvent).
Includes summary streaming events (SummaryChunkEvent).
JsonlTraceExporter.Builder.priority(int priority)
Hook priority (default: 900, low priority for logging/export).