'Structured Logs in Google Cloud Run not being parsed (using Winston for logging)

I'm attempting to format my logs in such a way that Google Cloud will correctly extract the log level. This is running on Cloud Run, with typescript. Cloud Run is grabbing the logs from the container output.

If I do the following, google correctly parses the log line:

console.log(JSON.stringify({
   severity: 'ERROR',
   message: 'This is testing a structured log error for GCP'
}));

And the log output looks like this: log level error

I've tried a number of different ways to format with winston, ended up with the following:

useFormat = format.combine(
      format((info, opts) => {
        info['severity'] = info.level;
        delete info.level;
        return info;
      })(),
      format.json());


    this.winston = winston.createLogger({
      level: logLevel,
      format: useFormat,
      transports: [new winston.transports.Console()]
    });

Which looks like it will work (it correctly outputs the json line), I get this in the GCP logs: enter image description here

Any help appreciated.

node.jstypescriptgoogle-cloud-platformwinstongoogle-cloud-run


Solution 1:[1]

Turns out I was close, just needed to .upperCase() the log level (and I'm mapping Verbose -> Debug, I don't really understand why GCP decided to do a totally different log leveling system than everyone else). New code:

useFormat = 
    format.combine(
      format((info, opts) => {
        let level = info.level.toUpperCase();
          if(level === 'VERBOSE') {
            level = 'DEBUG';
          }

          info['severity'] = level;
          delete info.level;
          return info;
      })(),
      format.json());

Solution 2:[2]

The last bit of the question is confusing. The problem OP is pointing to is that the json is printed out and the severity is default. The json should not be printed out, only the message, and the severity should be debug. The answer that OP provides does what is wanted.

For others that may be confused in the same way I was.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Patrick White
Solution 2 Carb

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