Only some Winston logger.error calls appear in the GCP error reporting

I'm using Winston in my Node.js application on GCP as described here: https://cloud.google.com/logging/docs/samples/logging-winston-quickstart That works in a sense that I see the logs I expect in the log explorer.

I now want to that all errors appear in the "Error Reporting" dashboard (https://console.cloud.google.com/errors?project=...). However, only some errors are listed there. I am not 100% sure which errors make it to the error reporting dashboard, but my suspicion is that logger.error calls only appear in the error dashboard if there's a proper error stack trace.

But that's not what I want. I want that whenever logger.error in my application is triggered, an error group on the error reporting dashboard should be created - regardless of the string I pass to logger.error. How do I do that?

It seems, setting @type is not quite easy in Winston, but it's possible to add a (kind of artificial) stacktrace to the message like:

format: winston.format.combine(
    winston.format((info) => {
        if (info.level === 'error') {
            Object.assign(info, { message: `${info.message}${(new Error()).stack}` });
        }
        return info;
    })
...
)

That did the trick for me at least.