Noticing, tracking and debugging errors should be easy. A developer or site/tool maintainer involved with the Wikimedia movement should be able to easily notice new errors (possibly only a subset of them that they are interested in), find out details, and share with others. WMF should provide infrastructure for this via Labs. At the same time security and privacy standards should be enforced.
Needs a labs project, policies and access controls, documenting and popularizing Sentry, testing and feedback.