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sentry (plural sentries) 1  A guard, particularly on duty at the entrance to a military base. ( 2 uncountable) Sentry duty; time spent being a sentry. ( 3 nautical) A form of drag to be towed underwater, which on striking bottom is upset and rises to the surface.
Sentry started as a Django-only exception handling service but now has separate logging clients to cover almost all major languages and frameworks. It still works really well for Python-powered web applications and is often used in conjunction with other monitoring tools. Raven is open source Python client for Sentry.