feat(k6): ✨  add p99 metadata (#1514)
feat(k6): ✨  add p99 metadata (#1514)

Enables graphs to show the proper unit (milliseconds) for p99 metrics
DataDog/integrations-extras,DataDog/integrations-extras,DataDog/integrations-extras,DataDog/integrations-extras,DataDog/integrations-extras