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node_modules/pino/docs/diagnostics.md

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+# Diagnostics
+
+Pino provides [tracing channel](tc) events that allow insight into the
+internal workings of the library. The currently supported events are:
+
++ `tracing:pino_asJson:start`: emitted when the final serialization process
+  of logs is started. The emitted event payload has the following fields:
+  - `instance`: the Pino instance associated with the function
+  - `arguments`: the arguments passed to the function
++ `tracing:pino_asJson:end`: emitted at the end of the final serialization
+  process. The emitted event payload has the following fields:
+  - `instance`: the Pino instance associated with the function
+  - `arguments`: the arguments passed to the function
+  - `result`: the finalized, newline delimited, log line as a string
+
+[tc]: https://nodejs.org/docs/latest/api/diagnostics_channel.html#tracingchannel-channels