2.0.0

Time for a new major version!

This release contains changes that could break/change the behaviour of some existing locust files (but probably not many).

User ramp up/down and User type selection is now controlled by the master instead of autonomously by the workers

This has allowed us to fix some issues with incorrect/skewed User type selection and undesired stepping of ramp up. The issues were especially visible when running many workers and/or using LoadShape:s. This change also allows redistribution of Users if a worker disconnects during a test. This is a major change internally in Locust so please let us know if you encounter any problems (particularly regarding ramp up pace, User distribution, CPU usage on master, etc)

Other potentially breaking API changes

• Change the default User weight to 1 instead of 10 (the old default made no sense)
• Fire test_start and test_stop events on workers too (previously they were only fired on master/standalone instances)
• Workers now send their version number to master. Master will warn about version differences, and pre 2.0-versions will not be allowed to connect at all (because they would not work anyway)
• Update Flask dependency to 2.0

Significant merged PR:s (and prerelease version they were introduced in)

• Allow workers to bypass version check by sending -1 as version (2.0.0) #1830
• Improve logging messages and clean up code after dispatch refactoring (2.0.0b4) #1826
• Remove user_classes_count from heartbeat payload (2.0.0b4) #1825
• Add option to set concurrency of FastHttpUser/Session (2.0.0b3) #1812
• Fire test_start and test_stop events on worker nodes (2.0.0b3) #1777
• Auto shrink request stats table to fit terminal (2.0.0b2) #1811
• Refactoring of the dispatch logic to improve performance (2.0.0b2) #1809
• Check version of workers when they connect. Warn if there is a mismatch, refuse 1.x workers to connect (2.0.0b1) #1805
• Change the default User weight to 1 instead of 10 (2.0.0b1) #1803
• Upgrade to Flask 2 (2.0.0b1) #1764
• Move User selection responsibility from worker to master in order to fix unbalanced distribution of users and uneven ramp-up (2.0.0b0) #1621