On the distribution database, you can execute the statement below to get the sizes of the internal replication specific tables
You can use the code below on your distributor in order to check the backlog of the replication
You can use the t-sql code to resume/suspend all databases from the always on group.
In SSMS you have the “schema changes history” report. You can have the same (or even more) details from T-SQL. You can use the t-sql statement below in order find schema changes the last day, in a particular database.