[Logger]Is there a way to output log level with CRITICAL ?

[H1Gdev]

Is there a way to output CRITICAL log like in AWS Lambda Powertools for Python ?

[dreamorosi]

Hi @H1Gdev, no, at the moment we don't support this level.

Powertools for Python builds on top of Python's logging module that is part of the standard library. As such, that version of Powertools supports the same levels that the logging module supports:

Level	Numeric Value
CRITICAL	50
ERROR	40
WARNING	30
INFO	20
DEBUG	10
NOTSET	0

Node.js on the other hand, deals with logs differently and doesn't have a strict level structure like Python does. The closest thing to Python's logging library in Node.js is the Console object.

The Console object does have some methods like info, debug, warn, error, etc. but doesn't have a concept of levels, and most importantly for this discussion, doesn't have a method that maps to CRITICAL. In Node.js, using one method or the other only influences whether the log will be emitted to stdout or stderr with warn and error going to stderr and all others going to stdout.

In Powertools for Typescript however the log level doesn't just influence the which Console method will be used to log, but it also influences the fact that logs will contain a level key (see docs).

With this in mind, would you mind sharing a bit more about your use case to understand why a CRITICAL level is needed and what would be the advantage over using the existent ERROR one?

[H1Gdev]

Thanks for your answer.

I would like to monitor lambda function logs by level key. (using Amazon CloudWatch)
In another lambda function(using Python), ERROR and CRITICAL are already used properly, so I would like to use them differently in new lambda function(using Node.js) under the same conditions.

I understand that there is no suitable method in Node.js.
Is there a way to set level key to CRITICAL in Node.js ?

[dreamorosi]

Is there a way to set level key to CRITICAL in Node.js ?

At the moment you can't, and even if you tell TypeScript to ignore the type (or use JavaScript), it will log a warning and default to INFO.

I would like to monitor lambda function logs by level key. (using Amazon CloudWatch)
In another lambda function(using Python), ERROR and CRITICAL are already used properly, so I would like to use them differently in new lambda function(using Node.js) under the same conditions.

Makes sense. Would you mind please opening a feature request so that we can track interest and discuss implementing it?

[H1Gdev]

@dreamorosi

Thank you for adding CRITICAL level.