https://learn.microsoft.com/en-us/azure/private-link/private-endpoint-overview

Disaster recovery with Managed Instance link - Azure SQL Managed Instance You can configure a hybrid disaster recovery solution between SQL Server hosted anywhere and Azure SQL Managed Instance by using the Managed Instance link.
With SQL Server 2022, either SQL Server or Azure SQL Managed Instance can be the primary and you can establish the link initially from either SQL Server or SQL Managed Instance. You can fail over between SQL Server and Azure SQL Managed Instance in either direction, as needed.
Reference:
https://learn.microsoft.com/en-us/azure/azure-sql/managed-instance/managed-instance-link-disaster-recovery

The rows per distribution can vary up to 10% without a noticeable impact on performance. Here the distribution varies more than 10%. It is skewed.
Note: SHOWSPACEUSED displays the number of rows, disk space reserved, and disk space used for a specific table, or for all tables in a Azure Synapse Analytics or Parallel Data Warehouse database.
This is a very quick and simple way to see the number of table rows that are stored in each of the
60 distributions of your database. Remember that for the most balanced performance, the rows in your distributed table should be spread evenly across all the distributions.
ROUND_ROBIN distributed tables should not be skewed. Data is distributed evenly across the nodes by design.
Reference:
https://docs.microsoft.com/en-us/azure/synapse-analytics/sql-data-warehouse/sql-data-warehouse-tables-distribute
https://github.com/rgl/azure-content/blob/master/articles/sql-data-warehouse/sql-data-warehouse-manage-distributed-data-skew.md

The Plan Comparison menu option allows side-by-side comparison of two different execution plans, for easier identification of similarities and changes that explain the different behaviors for all the reasons stated above. This option can compare between:
Two previously saved execution plan files (.sqlplan extension).
One active execution plan and one previously saved query execution plan.
Two selected query plans in Query Store.

Auditing an instance of SQL Server or a SQL Server database involves tracking and logging events that occur on the system. The SQL Server Audit object collects a single instance of server-level or database-level actions and groups of actions to monitor. The audit is at the SQL Server instance level. You can have multiple audits per SQL Server instance. The Database- Level Audit Specification object belongs to an audit. You can create one database audit specification per SQL Server database per audit.
Reference:
https://docs.microsoft.com/en-us/sql/relational-databases/security/auditing/create-a-server-audit-and-database-audit-specification