IMO it is not as widespread because it isn't a good practice. Health monitoring, metrics and logging are orthogonal and really should be handled separately. Monitoring makes sure everything is working properly, metrics is about understanding how it is being used, and logging is about peering inside what is happening. Conflating them hinders their application and makes them less useful.
When a customer complains that something's not right, and you check your logs, and the logs have been spewing millions of alarming messages for hours that you wish you had seen before the customer noticed issues, that's when you wish the programmer who wrote the log lines had used the health monitoring framework instead of the logging framework.
