fix(opentelemetry): tostring header_type
avoid concatenation nil error in log
#13612
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This is a backport of the https://github.com/Kong/kong-ee/pull/10137
Summary
The require of header_type is false, so the consumer can choose
header_type
to be nil in Kong Manager; if this is, Kong Manager would passjson.null
to Kong,header_type
could be nil in this case.This PR respects this behavior and handles concatenation nil error when
header_type
is nil.Checklist
CHANGELOG/unreleased/kong
or addingskip-changelog
label on PR if unnecessary. README.mdIssue reference
Fix: FTI-6119