Extend status and outages APIs to secondary data holders

[ShaneDoolanAdatree]

Description

Recent issues with AEMO, specifically metering data, has further highlighted the need for ADRs to have at least some visibility into the state of secondary data holder systems without us having to bother primary data holders.

Area Affected

Common APIs

• Get Status
• Get Outages

Change Proposed

Have secondary data holders implement the same status and outages endpoints as primary data holders.