As per the user reports from multiple countries, data / statistics such as IP Reputation, Domain Reputation, Spam rate, etc. has stopped updating in Google Postmaster Tools aka GPT since 19 April, 2021.
Firstly, we need to understand this has not happened for the first time, there have been multiple instances of the same issue and over the time this glitch in Google systems gets rectified. But to get this resolved, we have reported this to Google team directly and hope this time also the data gets populated very soon.
Thinking, what you can do? We suggest all GPT users to report this using Feedback utility in GPT itself and post on Google Product Forums. This will help Google engineers to prioritise this issue.
For reference: https://support.google.com/mail/thread/107567747, https://support.google.com/mail/thread/8269452, https://support.google.com/mail/thread/8571292, https://support.google.com/mail/thread/8421770