You could always link your builds with "Debian" - so it'll get rebuilt whenever Debian pushes out a change. That'll ensure you're repo gets built regularly and stops these random fails from being a problem as they'll no-doubt get retried before too long.
Perhaps you can repush and update Sensu to version 0.26.5 whilst we're there?
Looks like the Docker build of this repo failed a few weeks back: https://hub.docker.com/r/sstarcher/sensu/builds/bebvh7em4nnbf7qeagg3fqh/
You could always link your builds with "Debian" - so it'll get rebuilt whenever Debian pushes out a change. That'll ensure you're repo gets built regularly and stops these random fails from being a problem as they'll no-doubt get retried before too long.
Perhaps you can repush and update Sensu to version 0.26.5 whilst we're there?