Remove incorrect fields from the schema of ModelFilling3.
Provide default value to thread counts in NonBlockingHttpServerBuilder.
Fix a mis-used private ByteOutputStream.
Implement generic logging and stats collection interfaces.
Fix some texts in operation metadata page.
Use wrapper logging mechanism instead of slf4j logging.
Use listener to initialize Baiji service to make sure its initialization independent with any incoming request.
Add checkHealth method to TestService.
Support determining response content type based on the Accept header.
Fix errors in metadata pages.
Fix the incorrect metadata page redirect logic.
Only start the heartbeat timer when having service registered in the registry.