How to find out what is the developername value for a wave dashboard?
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Looking at Dashboards List Resource you could use the REST API to iterate the available Wave Dashboards.
From the example response the keyprefix for a Wave Dashboard is 0FK. You could check the Partner API for the corresponding sObject. If it is exposed a SOQL query could also iterate the available dashboards.
The easiest is on a dashboard to switch to JSON Editor via CRTL+E, at the top of the JSON you can see the developer name.