A project administrator in JIRA is primarily responsible for managing user permissions. This includes controlling who can access the project, what actions they can perform, and what information they can view or modify within the project. By managing permissions, the project administrator ensures that only authorized individuals have access to sensitive project data, maintaining security and confidentiality.

Reporting in JIRA serves the purpose of tracking progress and monitoring performance. It allows teams to generate various reports to analyze project status, identify bottlenecks, and make data-driven decisions. Reporting helps in understanding project health, resource allocation, and productivity metrics.

In JIRA, the "Blocks" issue link type is used to indicate that one issue depends on another. This relationship signifies that the completion of the dependent issue is necessary for the progress of the blocking issue.

The "Browse Projects" permission in JIRA is significant as it allows users to view all projects within the JIRA instance. This permission is fundamental for users to navigate through different projects, understand their scope, and access relevant information. However, it does not grant the ability to make changes to project details or delete projects; those actions require additional permissions.

Bulk Operations in JIRA are used when you need to perform the same action on multiple issues simultaneously. This could include updating fields, transitioning issues through workflow states, or performing actions like linking issues. It streamlines the process and saves time by avoiding the need to make changes to each issue individually.

In JIRA, administrators can add new users through the administration panel. This involves navigating to the user management section and selecting the option to add a new user. Alternatively, users can also be imported from a CSV file or created programmatically using the JIRA REST API.

Documenting workflow processes and changes ensures transparency and traceability, which are crucial for compliance and auditability. It provides a clear record of how processes are executed and any modifications made, aiding in regulatory compliance and audit readiness.

JIRA Filters allow users to save and share commonly used search criteria. By saving a filter, users can easily access and reuse specific search queries, making it a convenient feature for teams to collaborate on issue tracking and management.

JIRA integrations can improve team productivity by enhancing data analysis capabilities, enabling teams to make data-driven decisions and optimize their workflows more effectively.

Velocity is the metric used in Agile to measure the amount of work completed by a team in a fixed time frame, typically a sprint. It helps teams understand their capacity and predictability.