Sidekiq is a Ruby framework that enables developers to asynchronously process computationally intensive tasks, such as bulk email sending and payment processing, to improve application response times. Datadog's integration with Sidekiq Pro or Enterprise provides a single platform for monitoring job progress, applications, and metrics in real-time, allowing users to track the success and failure rates of jobs, set up alerts for potential issues, and troubleshoot congested queues. The integration also includes built-in support for Redis, enabling users to monitor memory usage and correlate it with queued Sidekiq jobs to determine whether job processors are able to keep up with their workload. Additionally, Datadog's APM auto-instruments Ruby applications, allowing users to quickly start tracing long-running Sidekiq jobs and identify potential issues, such as slow job latency or failed retries.