Note that Tempdb contention refers to a bottleneck for threads trying to access allocation pages that are in-memory; it has nothing to do with I/O.
The grid contains the following columns:
SQL Statement
The SQL Statement responsible for causing the contention.
Session ID
ID of the session running the SQL Statement.
The ID is hyper-linked to the same session on the SQL Activity drilldown | Sessions page.
Wait Type
The type of wait that Azure SQL Managed instance has recorded and which is preventing a current request from being run.
Wait Duration
The total wait time in milliseconds spent waiting.
Blocking Session
The ID of the session that is blocking the request.
Resource ID
The ID of the resource being waited on.
Page ID
The ID of the page being waited on.
Resource Type
The type of page being waited on - GAM (Global Allocation Map) or SGAM (Shared Global Allocation Map) or PFS (Page Free Space)
Application
The application running the SQL Statement.
Host
The name of the cloud VM hosting the Azure SQL Managed instance.
User
The Azure SQL Managed instance login name for this session.