The 'Diagnostics' tab takes you to the Issues relating to your account:
1. Account Level Issues: are serious and can result in account suspension.
2. Feed Issues: This section lists data feeds that have
an issue
that
prevents Google
from processing
an entire feed, such as upload issues, fetch errors, and expired feeds.
3. Item Issues: This section contains issues that impact individual items, If items are affected by multiple issues, they’ll be included in all of them. You can also download a report that contains all of the affected items in your account and their issues across all of your target countries from the main page of the item issues section.
The issues in red are serious errors which can result in account suspension.
The issues in yellow are warnings, which do need to be addressed, as they could negatively impact the performance of your ads.
