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@raven667 @inthehands
The downstream contractor was raising the faults. The policy of Big Mining Company was that subcontractors should never be allowed to talk to each other and preferably never even know of each others existence.
The behaviour in question was our system responding to an error condition and that did not happen frequently. We repeatedly told them it was expected behaviour but the other subcontractor wanted a lot of money to re-write sections of their system. We tried to put mitigation in place but without knowing why it was a problem we were a bit hamstrung.