In the December 2019 update for Kibana, several notable changes and improvements were highlighted across different components. Kibana's security was enhanced by allowing it to be instrumented with APM, and deprecated Node.js APIs were cleaned up to prevent future errors. The platform introduced new APIs, including "uiCapabilities" for plugins, and validated configuration before running migrations. Enhancements to Stack Services Alerting enabled KQL nested queries and allowed filtering of alerts by action type, while some email actions were whitelisted. The Kibana Platform migration efforts included various tasks like applying filter actions and state management improvements, alongside bug fixes. In the Kibana App section, Elastic Charts saw progress with pie charts, series identifiers were refactored, and Dependabot was configured for automatic dependency updates. Elastic Maps improved symbolization consistency by using extended statistical metadata, providing users with more reliable visual representations while allowing configuration for style adjustments. Additionally, Canvas updates were noted, EuiBasicTable was converted to TypeScript, and DataGrid enhancements were made. The operations updates ensured CI changes were aggregated into a single comment to reduce PR noise.