anchor.diff:  
   If using Postgres, backups may be taken on the Postgres database, or Postgres may be configured for high availability such that there is a failover or backup instance.
   
  -If starting a brand new NiFi Registry instance, the metadata database can be automatically rebuilt from the information in the `GitFlowPersistenceProvider`. This is a one-time operation during the first start of the application, and is not meant to keep the DB in sync with external changes made in git. This feature only applies to flows and would not be able to restore information about extension bundles.
  +If starting a brand new NiFi Registry instance, the metadata database can be automatically rebuilt from the information in the `GitFlowPersistenceProvider`. This is a one-time operation during the first start of the application, and is not meant to keep the DB in sync with external changes made in Git. This feature only applies to flows and would not be able to restore information about extension bundles.
   
   === Persistence Providers
   
  
positive.code: |==================================================================================================================================================
  
  === LoggingEventHookProvider
  The LoggingEventHookProvider logs a string representation of each event using an SLF4J logger. The logger can be configured
  via NiFi Registry’s logback.xml, which by default contains an appender that writes to a log file named nifi-registry-event.log in the logs directory.
  
  ....
  <eventHookProvider>
  
negative.code: 
  ==== S3BundlePersistenceProvider
  
  The `S3BundlePersistenceProvider` stores the content of extension bundles in a AWS S3 bucket. The bucket is expected to already exist and be accessible to the credentials provided to the persistence providcer.
  
  NOTE: This provider must be added to the classpath by specifying a custom extension directory in _nifi-registry.properties_, such as `nifi.registry.extension.dir.aws=./ext/aws/lib`, where `./ext/aws/` contains the contents of the extracted _nifi-registry-aws-assembly-<version>-bin.zip_.
  
  The key of an extension bundle in the S3 bucket will be the following:
  ....
  