With the launch of Profiling, Sentry has moved to unit-based pricing for Performance Monitoring. Customers will be charged based on a volume of total Performance units for different Performance event types: 

• Transactions - use 1 Performance Unit and sent from projects with only Tracing configured.

• Transactions with Profiling - use 1.3 Performance Units and sent from projects that have Profiling configured.

Performance units replaced what is previously known as a 'reserved transactions quota'.