Log tweaks: Include environment information in log messages, use syslog logging levels.

[adunkman]

As a followup to our audit logging discussions on Friday:

• Include the environment in log messages. This will help filter messages in Kibana to only the environment we’re interested in (stg, dev, mig, irs, etc).

  • I also included the environment’s color configuration in the logs as well. That seems like it will be very helpful for metrics (ensuring requests switch colors when an environment switches colors, especially considering DNS propagation may be required).

• Use syslog logging levels. This configures Winston to use syslog levels as specified in RFC5424:

  { 
    emerg: 0, 
    alert: 1, 
    crit: 2, 
    error: 3, 
    warning: 4, 
    notice: 5, 
    info: 6, 
    debug: 7
  }

  As per discussion, we’d like to continue to configure LOG_LEVEL to info, but would like to introduce using notice for logging messages which are required for auditing purposes.

[mmarcotte]