the.com/sentry
A human burglar alarm paid to stay awake while everyone else sleeps soundly.
means A soldier or guard posted to keep watch and control passage at a specific spot.
from Likely a clipped form of sanctuary, twisted into seventeenth-century military slang for a watchman, possibly tangled with French sentinelle.
Box originSentry box shelters guards from weather, not bullets.
Royal ritualBuckingham Palace sentries never break their fixed routine.
Software namesakeA popular error-tracking tool watches code crashes.