* plugin/kubernetes: skip zone serial bump on DNS neutral pod updates
In pods verified mode every pod update event bumped the zone modified
timestamp, even when the pod IP did not change. Pod records only depend
on the pod IP, so routine status churn (conditions, container statuses,
labels) caused spurious SOA serial changes and needless zone transfer
activity, even though pod records are not part of transfers at all.
Only bump the modified timestamp when the pod IP changes, mirroring how
service and endpoint updates are already filtered. Also update the pods
verified documentation to describe the actual overhead: modest memory
for a stripped down pod object, plus watch load on the API server.
Ref #8043
Signed-off-by: Karan V <karanvknarayanan@gmail.com>
* plugin/kubernetes: keep pods verified cost description neutral
Avoid characterizing the memory overhead as modest until benchmark
data quantifies it. State only what the code does: the watch requires
additional memory in CoreDNS and adds load to the API server.
Signed-off-by: Karan V <karanvknarayanan@gmail.com>
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Signed-off-by: Karan V <karanvknarayanan@gmail.com>
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