Selectively send all long-running traces?

[brianchizhang]

For purpose of improving response time, would it be possible to selectively send traces of long running calls via jeager client?

E.g. send traces for all calls more than 5 seconds long.

[jpkrohling]

This is probably related to #425, as the sampling decision is currently made at the very first span (root span) of a trace and propagated down to all child spans.

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