As we discussed earlier, with the log crate, we need to import the following logging macros. We can use the following:

• trace!
• debug!
• info!
• warn!
• error!

These are ordered by the importance of the information they print, with trace! being the least important and error! being the most important:

• trace!: Used to print verbose information about any pivotal activity. It allows web servers to trace any incoming chunk of data.
• debug!: Used for less verbose messages, such as the incoming server requests. It is useful for debugging.
• info!: Used for important information such as the runtime or server configuration. It is rarely used in library crates.
• warn!: Informs the user about non-critical errors, such as if the client has used broken cookies or if the necessary microservice is temporarily unavailable and cached data is used for responses instead.
• error!: Provides an alert about critical errors. This is used when the database connection is broken.

We imported the necessary macro directly from the log crate.