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## Problem Since enabling continuous profiling in staging, we've seen frequent seg faults. This is suspected to be because jemalloc and pprof-rs take a stack trace at the same time, and the handlers aren't signal safe. jemalloc does this probabilistically on every allocation, regardless of whether someone is taking a heap profile, which means that any CPU profile has a chance to cause a seg fault. Touches #10225. ## Summary of changes For now, just disable heap profiles -- CPU profiles are more important, and we need to be able to take them without risking a crash.