Adds key traceSampled to MDC when set trace is observable#104

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dsd987 wants to merge 2 commits intopalantir:developfrom dsd987:dd/sampledMdc

+30-1

Commits on Mar 26, 2019

Adds key traceSampled to MDC when set trace is observable. Will be set to 1 if observed and not present when not observed.
David Dunn
committed
Addressing nits
David Dunn
committed