B3BP:STDIO_REPLACE_DATETIMES
{datetime} UTC [    debug] cli arg arg_f = () -> {tmpdir}/x
{datetime} UTC [     info] You are on {os}
{datetime} UTC [    debug] Info useful to developers for debugging the application, not useful during operations.
{datetime} UTC [     info] Normal operational messages - may be harvested for reporting, measuring throughput, etc. - no action required.
{datetime} UTC [   notice] Events that are unusual but not error conditions - might be summarized in an email to developers or admins to spot potential problems - no immediate action required.
{datetime} UTC [  warning] Warning messages, not an error, but indication that an error will occur if action is not taken, e.g. file system 85% full - each item must be resolved within a given time. This is a debug message
{datetime} UTC [    error] Non-urgent failures, these should be relayed to developers or admins; each item must be resolved within a given time.
{datetime} UTC [ critical] Should be corrected immediately, but indicates failure in a primary system, an example is a loss of a backup ISP connection.
{datetime} UTC [    alert] Should be corrected immediately, therefore notify staff who can fix the problem. An example would be the loss of a primary ISP connection.
{datetime} UTC [emergency] A "panic" condition usually affecting multiple apps/servers/sites. At this level it would usually notify all tech staff on call.
{datetime} UTC [     info] Cleaning up. Done