Show indication of debug and firehose traces

[yurishkuro]

Requirement - what kind of business use case are you trying to solve?

Sometimes it's useful to know if the trace was captured with debug or firehose flags.

Problem - what in Jaeger blocks you from solving the requirement?

Span.flags is currently not rendered in the UI.

Proposal - what do you suggest to solve the problem or improve the existing situation?

Add "debug" and "firehose" pills to span details (next to span ID), with (?) tooltip explaining the meaning of each flag.

• firehose: "Spans captured in the firehose mode are not indexed by tags and duration"
• debug: "This trace was marked as a debug request, which may result in higher level of instrumentation detail captured"