The primary stakeholders involved in creating and using error budgets include Site Reliability (SRE) engineers, DevOps teams, product development/product engineering teams, and product management teams. The titles and department names may be different in your organization, but the primary responsibilities across these groups include:

• Writing code for new features and fixing errors (engineers/developers)
• Managing applications in a production-ready state (SREs)
• Deploying and monitoring applications in production (SREs / DevOps)
• Managing release schedules and prioritizing work to meet customer requirements (product management)

If you want to implement an error budget for your project, there are several stakeholders that you may need to consider reaching out to. It begins from the dev teams getting brief introductions up to the business owners with detail conversations. 

Development team: The development team is responsible for implementing the error budget, so it is essential to involve them in the process. They can provide insights into how the error budget will impact their work and suggest improvements to the process.

Testing team: The testing team is responsible for ensuring the quality of the software, so they will need to be involved in the development of the error budget. They can provide input on the types of errors that are most critical and suggest ways to improve the testing process to catch these errors.

Product owners: Product owners are responsible for defining the requirements and priorities for the software, so it is essential to involve them in the development of the error budget. They can provide input on the types of errors that are most critical to the business and suggest improvements to the product roadmap based on the results of the error budget.

Project managers: Project managers are responsible for overseeing the project and ensuring that it is delivered on time and within budget. They can provide insights into how the error budget will impact the project timeline and suggest ways to optimize the process to minimize the impact of errors.

Operations team: The operations team is responsible for maintaining the software once it is deployed, so they will need to be involved in the development of the error budget. They can provide input on the types of errors that are most critical for the production environment and suggest ways to improve the deployment process to minimize the impact of errors.

By involving these stakeholders in the development of the error budget, you can ensure that all perspectives are considered, and the error budget is tailored to the specific needs of the project.