fix(prometheus): use configure() handler to toggle upstream_health_metrics #13983
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Summary
This setting was added before we had the :configure() phase handler and
relied instead on the :log() handler to toggle itself. I suspect that
there is some buggy behavior in this approach, but it's hard to craft a
test case to reliably confirm. In any case, this commit updates the
plugin to use the :configure() handler to toggle the setting, as this is
now the idiomatic way of performing this task.
Checklist
changelog/unreleased/kong
orskip-changelog
label added on PR if changelog is unnecessary. README.mdThere is a user-facing docs PRIssue reference
KAG-5984