Update known issues for Azure Synapse Analytics

Removed the known issue regarding Spark session startup times and added its resolution status.

Author: kevinjaku

articles/synapse-analytics/known-issues.md

@@ -43,7 +43,6 @@ To learn more about Azure Synapse Analytics, see the [Azure Synapse Analytics Ov
 |Azure Synapse Workspace|[Known issue incorporating square brackets [] in the value of Tags](#known-issue-incorporating-square-brackets--in-the-value-of-tags)|Has workaround|
 |Azure Synapse Workspace|[Deployment Failures in Synapse Workspace using Synapse-workspace-deployment v1.8.0 in GitHub actions with ARM templates](#deployment-failures-in-synapse-workspace-using-synapse-workspace-deployment-v180-in-github-actions-with-arm-templates)|Has workaround|
 |Azure Synapse Workspace|[No `GET` API operation dedicated to the `Microsoft.Synapse/workspaces/trustedServiceBypassEnabled` setting](#no-get-api-operation-dedicated-to-the-microsoftsynapseworkspacestrustedservicebypassenabled-setting)|Has workaround|
-|Azure Synapse Apache Spark pool|[Starting a Spark session (with custom python libraries) is taking longer than usual](#starting-a-spark-session-with-custom-python-libraries-is-taking-longer-than-usual)|Has mitigation|
 
 
 ## Azure Synapse Analytics dedicated SQL pool active known issues summary
@@ -309,36 +308,6 @@ ORDER BY [schema_name], [table_name], [column_name];
 ```
 
 In addition to mitigating this issue, maintaining fresh statistics can improve overall query performance. 
- 
-
-## Azure Synapse Apache Spark pool active known issues summary
-
-### Starting a Spark session (with custom python libraries) is taking longer than usual
-
-There is a known issue impacting session startup time when python libraries (requirements.txt or .whl) are attached to the spark pool. Customers will experience slow session startup times intermittently. This is impacting both Fabric and Synapse. 
-
-**Workaround**: The mitigation has been applied to following regions. With this mitigation, the session startup has been improved significantly, but might still be 1.5x slower than original baseline.
-
-|Mitigated Synapse Regions|
-|------------------------|
-|PolandCentral|
-|EastUS|   
-|EastUS2EUAP|
-|SouthEastAsia|
-|AustraliaEast|
-|WestUS2|
-|NorthEurope|
-|SwedenCentral|
-|WestUS3|
-|QatarCentral|
-|JioIndiaWest|
-|SouthIndia|
-|IsraelCentral|
-|ItalyNorth|
-|SwitzerlandWest|
-|WestEurope|
-
-
 
 ## Recently closed known issues
 
@@ -349,6 +318,7 @@ There is a known issue impacting session startup time when python libraries (req
 |Azure Synapse Apache Spark pool|[Failed to write to SQL Dedicated Pool from Synapse Spark using Azure Synapse dedicated SQL pool Connector for Apache Spark when using notebooks in pipelines](#failed-to-write-to-sql-dedicated-pool-from-synapse-spark-using-azure-synapse-dedicated-sql-pool-connector-for-apache-spark-when-using-notebooks-in-pipelines)|Resolved|June 2023|
 |Azure Synapse Apache Spark pool|[Certain spark job or task fails too early with Error Code 503 due to storage account throttling](#certain-spark-job-or-task-fails-too-early-with-error-code-503-due-to-storage-account-throttling)|Resolved|November 2023|
 |Azure Synapse Apache Spark pool|[Query failure with a LIKE clause using Synapse Dedicated SQL Pool Connector in Spark 3.4 runtime](#query-failure-with-a-like-clause-using-synapse-dedicated-sql-pool-connector-in-spark-34-runtime)|Resolved|October 2024|
+|Azure Synapse Apache Spark pool|[Starting a Spark session (with custom python libraries) is taking longer than usual](#starting-a-spark-session-with-custom-python-libraries-is-taking-longer-than-usual)|Resolved|January 2026|
 
 ## Azure Synapse Analytics serverless SQL pool recently closed known issues summary
 
@@ -392,6 +362,12 @@ The open source Apache Spark 3.4 has introduced an [issue](https://issues.apache
 
 **Status**: Resolved
 
+### Starting a Spark session (with custom python libraries) is taking longer than usual
+
+There was an issue impacting session startup time when python libraries (requirements.txt or .whl) are attached to the spark pool. Customers will experience slow session startup times intermittently.
+
+**Status**: Resolved
+
 ## Related content
 
 - [Synapse Studio troubleshooting](troubleshoot/troubleshoot-synapse-studio.md)