Trace across start handler invocations, nesting spans

[knrc]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR fixes the tracing scans created during the apiserver filters, ensuring they are correctly nested within each other.

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

N/A

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @knrc. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[dashpole]

looks great

[dashpole]

/sig instrumentation
/ok-to-test

[dashpole]

/assign

[dashpole]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 6a171b9b6a921969dc3aa397f99086433dbffe89

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: dashpole, knrc
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