Major Description
On master the format looks like the following:
{
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"total_duration_us":95,
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"encode_duration_us":27,
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"last_dispatch_duration_us":18,
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"total_dispatch_duration_us":40,
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"last_server_duration_us":null,
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"total_server_duration_us":null,
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"operation_name":"get",
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"last_local_id":"2",
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"operation_id":"85414",
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"last_local_socket":"127.0.0.1:11210:56218",
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"last_remote_socket":"127.0.0.1:11210:56218"
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}
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The RFC mentions that fields should only be added if present, so if a field is null (as the server duration) here it should be omitted instead of printing it with null.