History of metrics 2 changes

In crates/hub/src/metrics.rs, lines 459–470 on v0.9.19. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 459,470:crates/hub/src/metrics.rs.