Learn how to test your APIs with Spock, a comprehensive testing framework that uses Java and Groovy, leveraging the benefits of several existing Java frameworks.
A useful metric to track to help keep bugs out of production is the defect escape rate. Learn about it and how to track it to help you reduce the bugs in your own system.
Learn how to get started with Apache Livy, a project in the process of being incubated by Apache that interacts with Apache Spark through a REST interface.
If you haven't had a chance to explore Azure's Network Watcher, including the Network Security Group Flow logs, here's how to get the ELK integrated for analysis.
Azure Log Analytics lacks versatility, doesn't have any Log API connectors, and fails in terms of Java APIs. Check out how a sample project I made solves this problem.