Michał, an engineering manager at Opera Software, and his team use Sentry to track issues in their web services. They created a custom tool called `sentrycli` to help with advanced analysis of issues, which is separate from the community-driven `sentrycli` tool. The `sentrycli` tool allows users to cache events associated with an issue locally, query specific events, group events by attribute, and check stack traces. It also supports filtering options and can inspect custom logging data. The team uses `sentrycli` to verify fixes for issues in different browsers and releases, making it a valuable tool for their development workflow.