There's a problem with the latest tag fetch logic for some of the mirrored tags.

[JaeGerW2016]

Like docker.io/coredns/coredns

[JoshVanL]

Thanks @JaeGerW2016,

So I can reproduce the issue, can you confirm whether there are any search options present on the pod annotations?
These being the ones from this list

/assign

[JoshVanL]

Had a quick look and looks like I have found the issue. The cordns registry on docker.io has these tags available.

api.ImageTag{Tag:"011", SHA:"sha256:d3596431680bfa0220599c11f59d4c567408ac21af57d9ec6f2328f0bea8fd46", Timestamp:time.Time{wall:0x1a71c298, ext:63640665398, loc:(*time.Location)(nil)}, Architecture:"amd64", OS:"linux"}
api.ImageTag{Tag:"007", SHA:"sha256:b010831452297a91ede477429d93371aad2c18a3c75b977eb1c60535f27dbd9f", Timestamp:time.Time{wall:0x2fa5f7b0, ext:63636779675, loc:(*time.Location)(nil)}, Architecture:"amd64", OS:"linux"}
api.ImageTag{Tag:"006", SHA:"sha256:45772ece0316b989bac28d4d8be0fb7d05f7455f38b3221590417a07abe10208", Timestamp:time.Time{wall:0x11db4a00, ext:63636681305, loc:(*time.Location)(nil)}, Architecture:"amd64", OS:"linux"}
api.ImageTag{Tag:"010", SHA:"sha256:b86904e36dd0a567155669131f2c5129fbcf3b0d3ae7640f52f3d62256eebc08", Timestamp:time.Time{wall:0x4ff2cc0, ext:63636679588, loc:(*time.Location)(nil)}, Architecture:"amd64", OS:"linux"}
api.ImageTag{Tag:"008", SHA:"sha256:b13367ea8432f8528b2e5ff224cff9b9120fc9069fcc1c99c133b7951c819979", Timestamp:time.Time{wall:0x6687120, ext:63636675921, loc:(*time.Location)(nil)}, Architecture:"amd64", OS:"linux"}
api.ImageTag{Tag:"009", SHA:"sha256:3114cd283a764582e8e8230a2b233b6fa31efccc2448a3400ad3f2fa50406525", Timestamp:time.Time{wall:0x1a4ee4d0, ext:63636675897, loc:(*time.Location)(nil)}, Architecture:"amd64", OS:"linux"}

Since authors can choose to host images which do not follow their semvar, there are a number of options we can use to prevent these tags being considered in our search. I would recommend setting the following annotation on your coredns pods (replacing the container name if it is different).

match-regex.version-checker.io/coredns: ^v?\d+.\d+.\d+$

This will ensure that only tags which have the form of something like 1.2.3 or v4.5.6 will be considered.

[JoshVanL]

/unassign
/assign @JaeGerW2016