Github user jpeach commented on the pull request:
https://github.com/apache/trafficserver/pull/206#issuecomment-107664507
There's no way to know whether a metric was set by ``traffic_line``. The
best you can do is to say whether a metric was set by a specific API, but
that's complex and low value IMHO, and as you pointed out above, that
information is lost when the configuration is persisted.
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