BentoML recommended monitor and OOTB dashboard (DataDog#21593)

* dashboard and rec monitors

* nit

* Update bentoml/assets/dashboards/bentoml_overview.json

Co-authored-by: May Lee <may.lee@datadoghq.com>

* dashboard edits

* nit

* remove my host

* date change

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Co-authored-by: May Lee <may.lee@datadoghq.com>

Author: steveny91