Add explanation about "Self Time" in "Trace Graph" view

[quaff]

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

I don't understand what Self Time means.

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

It seems jaeger not documented about Self Time.

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

Add explanation in Help tip.

[yurishkuro]

Self-time is the total time spent in the span when it was not waiting on children. For example, a 10ms span that had two 4ms non-overlapping children will have self-time = 10ms - 2 x 4ms = 2ms.

[quaff]

I understand now, a hovercard should be there, other people may have the same question.