Azure Log Analytics is generally available in five more regions: CENTRAL US, EAST US 2, EAST ASIA, WEST US and SOUTH CENTRAL US
You can see the full list of available regions on the product web page.
Azure Log Analytics is part of Azure Monitor. It collects telemetry from a variety of sources and uses the query language from Azure Data Explorer to retrieve and analyse data.
Learn more about Azure Monitor and Log Analytics in the documentation.