ext_proc - sampling support
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area/ext_proc
area/matching
enhancement
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Description
*Title*: ext_proc - sampling support
*Description*:
We need the ability to sample ext_proc calls. A simple sample_rate field (0.0 to 1.0) within ext_proc filter that activates the filter and makes the external call only when necessary. This becomes especially useful when we finish implementing the async support, allowing users to selectively sample a fraction of traffic for observation.
Once sampled, the stream should be active for the entire request, honoring all the processing modes, etc.
cc @tyxia @htuch
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