What is the SAP HANA version you are currently on?
Not sure if you checked the HANA STUDIO-->PERFORMANCE-->LOAD option
We have several interesting reports that could be generated from HANA Studio
Infact doing this with a 3rd party tool could need additional investment and time for setup
I have found HANA studio reliable so far and have considered the OZSOFT management pack for monitoring HANA from Microsoft SCOM as a third party tool
But nothing is comparable to the data collected by HANA about itself