fix: Fix ingress monitoring data time unit

Created by: iawia002

What type of PR is this?

/kind bug

What this PR does / why we need it:

The units of these metrics should be seconds, not milliseconds.

Which issue(s) this PR fixes:

Fixes #3537 (closed)

Special notes for reviewers:

Does this PR introduced a user-facing change?

Fix ingress monitoring data time unit.

Additional documentation, usage docs, etc.:

/cc @harrisonliu5