What is the test for a plaintiff to succeed on an Eighth Amendment conditions-of-confinement claim?

To succeed on an Eighth Amendment conditions-of-confinement claim, a plaintiff must satisfy two requirements. First, he must show that the danger posed by the alleged indifference is "objectively, sufficiently serious." Farmer v. Brennan, 511 U.S. 825, 834 (1994) (internal quotation marks omitted). Second, he must demonstrate that, subjectively, prison staff acted with "deliberate indifference to inmate health or safety" in failing to address the purported danger. Id. (internal quotation marks omitted).