Explanation
These are two reasons why the integration is failing after migrating from Classic Knowledge to Lightning Knowledge. The URL formats for articles change when migrating from Classic Knowledge to Lightning Knowledge, so any integration that relies on URLs needs to be updated accordingly. Also, users need to have Modify All permission on the article type object to delete archived articles in Lightning Knowledge, whereas in Classic Knowledge they only needed Delete permission on the article type object. Verified References: :
URL Formats for Articles Change When Migrating from Classic Knowledge to Lightning Knowledge : Delete Archived Articles in Lightning Knowledge

Explanation
These are three considerations when adding a report chart to a Console Component. The report must contain a chart that displays data in a graphical format. The report must be a Summary or Matrix report that groups data by rows and columns. The report chart must be added to the Page Layout of the object that the report is based on. Verified References: :
https://help.salesforce.com/s/articleView?id=sf.console2_components_report_chart.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.reports_charts_overview.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.reports_format_types.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.reports_charts_adding_layouts.htm&type=5

Explanation
Entitlements and milestones are features that help you track service contracts and service level agreements (SLAs) in Salesforce. Entitlements are units of customer support, such as phone support or web support, that specify what kind of support a customer is eligible for. Milestones are time-dependent tasks that represent required steps in your support process, such as first response time or resolution time. By defining entitlements and milestones, you can ensure that each case goes through the set of steps required by your SLA and meets the time limits for each step. Verified References: [Entitlement Management]

Explanation
The Knowledge Base Dashboards and Reports AppExchange package is a free package that provides pre-built dashboards and reports to help you measure and improve your knowledge base. You can use this package to gather information on knowledge article usefulness, such as article ratings, views, feedback, searches, and gaps. Verified References: Knowledge Base Dashboards and Reports

Explanation
Setting up communication channel layouts in the object manager to use Insert Article into Social post is a solution that can enable article insertion into social interactions in Lightning Knowledge. Communication channel layouts allow administrators to customize how articles appear in different channels, such as email, chat, or social media. Insert Article into Social post is an action that allows agents to insert articles into social posts using Social Customer Service. Verified References: :
https://help.salesforce.com/s/articleView?id=sf.knowledge_communication_channel_layouts.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.knowledge_insert_article_content_email.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.social_customer_service_overview.htm&type=5