tracingEnabled flag was common for producers and consumers limiting control for selectively
tracingEnabled flag into
c.t.f.k.consumers.consumerTracingEnabled to enable/disable tracing for producers and consumers. The
tracing on producers is turned on by default and only traces if the parent span is present to avoid
creating single span traces. The tracing on consumers is turned off by default also to prevent
create single span traces.
More granular control to enable/disable tracing for producers and consumers is now available.
Differential Revision: https://phabricator.twitter.biz/D571064