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cbe140754b
The trace2 event target does not have an implementation for trace2_printf(). While the event target is for structured events, and trace2_printf() is for unstructured, human-readable messages, it may still be useful to wrap these unstructured messages in a structured JSON object. Among other things, it may reduce confusion when manually debugging using event trace data. Add a simple implementation for the event target that wraps trace2_printf() messages in a minimal JSON object. Document this in Documentation/technical/api-trace2.txt, and bump the event format version since we're adding a new event type. Signed-off-by: Josh Steadmon <steadmon@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>