Add FlipFlop Index

[tennlee]

No description provided.

[HCookie]

Can you provide more information about this metric?

• Why we should include it?
• It's value
• Paper details?

[nicholasloveday]

Can you provide more information about this metric?

• Why we should include it?
• It's value
• Paper details?

The two papers are https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/met.1732 and https://www.publish.csiro.au/ES/ES21010

It's required for Jive and is used internationally (it's already in Jive, we just need to migrate it across).

@aidanjgriffiths may be able to make a start on it.