disable if no procfs

test/runtests.jl

@@ -377,6 +377,7 @@ end
     else
         @test length(metrics) == 0
     end
+    if procfs_available
         # Not a pid
         empty!(Prometheus.DEFAULT_REGISTRY.collectors)
         procc = Prometheus.ProcessCollector(() -> "notapid")
@@ -389,6 +390,7 @@ end
         metrics = @test_logs (:error, r"pid from the lambda") Prometheus.collect(procc)
         @test length(metrics) == 0
     end
+end
 
 @testset "Prometheus.expose(::Union{String, IO})" begin
     r = Prometheus.DEFAULT_REGISTRY