When the baked agent package automatically creates the SSH access for
executing remote alert handlers by modifying .ssh/authorized_keys
it puts two spaces instead of just one after the word ssh-rsa. This
seems to make some versions of SSH unhappy and ignore that key. This
has been fixed. You need to rebake and reinstall your agents in order to
fix that after updating Check_MK.
As a workaround you can manually remove the duplicate space in
.ssh/authorized_keys in the home directory of the target user.
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