Automatic snapshot pre-release monthly-2021-09

Changes since last snapshot (monthly-2021-08)

Substrate changes

Runtime

• Generate storage info for pallet authority_discovery (#9428)
• Make System Events Private from the Runtime (#9619)
• pallet-vesting: Support multiple, merge-able vesting schedules (#9202)
• Custom Benchmark Errors and Override (#9517)
• Stabilize seal_debug_message (#9550)
• Improve call, and usage in pallet utility (#9418)
• Refactor Benchmarks for Less Wasm Memory Usage (#9373)

Client

• Fix state_subscribeRuntimeVersion for parachains (#9617)
• Integrate Wasmer into Substrate sandbox environment (#5920)
• Make choosing an executor (native/wasm) an explicit part of service construction (#9525)
• Simplify NativeExecutionDispatch and remove the native_executor_instance! macro (#9562)
• Limit the maximum number of wasm memory pages a runtime can have (#9308)

API

• Add methods param for RPC state_traceBlock (#9642)
• Remove dependency on sandboxing host functions (#9592)
• Better RPC prometheus metrics. (#9358)
• Integrate Wasmer into Substrate sandbox environment (#5920)
• DatabaseSource::Auto (#9500)
• Remove Filter and use Contains instead (#9514)
• Improve call, and usage in pallet utility (#9418)