Properly shutdown tracer to flush Spans

[mgencur]

This is a follow-up on knative/pkg#2566.

Changes

• Get a reference to Tracer and call the Shutdown function on it when finishing work. This will flush buffered Spans to Zipkin.

Release Note

Docs

[knative-prow]

@mgencur: The label(s) kind/<kind> cannot be applied, because the repository doesn't have them.

In response to this:

This is a follow-up on knative/pkg#2566.

Changes

• Get a reference to Tracer and call the Shutdown function on it when finishing work. This will flush buffered Spans to Zipkin.

/kind

Fixes #

Release Note

Docs

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[matzew]

/lgtm
/approve

[knative-prow]

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[mgencur]

@matzew Thanks!