These are completely normal information/records. We know about them and they do not point to any bug or problem. These errors started to appear as a side effect when we changed the push signatures sending from provisioning server but the consequence is that current cores (2.7.x and older) print these messages.
In next ESA version, they will not appear.
We are sorry for the inconvenience.
It is not possible to suppress those events now.
We hope that your monitoring software is capable to exclude them from watching.