DOC-14871: Product Change- PR #153617 - ui: add isolation level information to SQL activity pages (#20532)

* In sessions.md, added Default Isolation Level column. In active-statement-executions.md and active-transaction-executions.md, added Isolation Level column.

Author: florence-crl

src/current/_includes/v25.4/ui/active-statement-executions.md

@@ -10,6 +10,7 @@ Statement Execution | The SQL statement that was executed.
 Status | The status of the execution: `Preparing`, `Waiting`, or `Executing`.
 Start Time (UTC) | The timestamp when the execution started.
 Time Spent Waiting | The time the execution spent waiting and experiencing [lock contention]({{ link_prefix }}performance-best-practices-overview.html#understanding-and-avoiding-transaction-contention).
+Isolation Level | The [isolation level]({{ link_prefix }}transactions.html#isolation-levels) used for the statement execution.
 Application | The name specified by the [`application_name`]({{ link_prefix }}show-vars.html#supported-variables) session setting.
 
 To view details of an active statement execution, click an execution ID in the **Statement Execution ID** column to open the [**Statement Execution** details page](#statement-execution-details-page).

src/current/_includes/v25.4/ui/active-transaction-executions.md

@@ -14,6 +14,7 @@ Elapsed Time | The time elapsed since the transaction started.
 Time Spent Waiting | The amount of time the execution experienced [lock contention]({{ link_prefix }}performance-best-practices-overview.html#understanding-and-avoiding-transaction-contention).
 Statements | The number of statements in the transaction.
 Retries | The number of times statements in the transaction were retried.
+Isolation Level | The [isolation level]({{ link_prefix }}transactions.html#isolation-levels) used for the transaction execution.
 Application | The name specified by the [`application_name`]({{ link_prefix }}show-vars.html#supported-variables) session setting.
 
 To view details of an active transaction execution, click an execution ID in the **Transaction Execution ID** column to open the [**Transaction Execution** details page](#transaction-execution-details-page).

src/current/_includes/v25.4/ui/sessions.md

@@ -31,6 +31,7 @@ Memory Usage | Amount of memory currently allocated to the session followed by t
 Client IP Address | The IP address and port of the client that opened the session.
 User Name | The user that opened the session.
 Application Name | The application that ran the session.
+Default Isolation Level | The default [isolation level]({{ link_prefix }}transactions.html#isolation-levels) for transactions in the session.
 Actions | Options to cancel the active statement and cancel the session. These require the `CANCELQUERY` [system privilege]({{ link_prefix }}security-reference/authorization.html#supported-privileges) (or the legacy `CANCELQUERY` [role option]({{ link_prefix }}alter-role.html#role-options).<ul><li>**Cancel Statement:** Ends the SQL statement. The session running this statement will receive an error. </li> <li>**Cancel Session:** Ends the session. The client that holds this session will receive a "connection terminated" event.</li></ul>
 
 To view details of a session, click a **Session Start Time (UTC)** to display session details.