diff --git a/build.zig.zon b/build.zig.zon
index 192d973..62b8806 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -13,8 +13,8 @@
             .hash = "websocket-0.1.10-ZPISdUowBQAXIl_X9VpZozIxBLVf_o5wYjOMMdobrXF5",
         },
         .zio = .{
-            .url = "https://tangled.org/zzstoatzz.io/zio/archive/71a66ba.tar.gz",
-            .hash = "zio-0.0.0-psl_OZ-KAgBZMwnLnfkB2CmqbDl1lPkel4pjyPYpIvTC",
+            .url = "https://tangled.org/zzstoatzz.io/zio/archive/63baa64.tar.gz",
+            .hash = "zio-0.0.0-psl_OUGWAgDxD37k0-Rdvc0HRPwSM_sIB4JEQ0lhxjlN",
         },
         .pg = .{
             .url = "https://tangled.org/zzstoatzz.io/pg.zig/archive/c5a5607.tar.gz",
diff --git a/src/main.zig b/src/main.zig
index 34bf5aa..4567b26 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -182,6 +182,12 @@ const MetricsServer = struct {
                     \\# HELP zio_poller_registrations fds with an armed direction (collapse = erosion)
                     \\# TYPE zio_poller_registrations gauge
                     \\zio_poller_registrations {d}
+                    \\# HELP zio_poller_arm_failures_total failed poller arms (fd closed, or the epoll watch limit). nonzero = new connections/reconnects cannot be armed
+                    \\# TYPE zio_poller_arm_failures_total counter
+                    \\zio_poller_arm_failures_total {d}
+                    \\# HELP zio_poller_last_arm_errno errno of the most recent failed arm (9=EBADF, 28=ENOSPC, 12=ENOMEM)
+                    \\# TYPE zio_poller_last_arm_errno gauge
+                    \\zio_poller_last_arm_errno {d}
                     \\# HELP zio_dns_spill DNS spill pool depth and workers
                     \\# TYPE zio_dns_spill gauge
                     \\zio_dns_spill{{kind="queued"}} {d}
@@ -191,10 +197,11 @@ const MetricsServer = struct {
                     \\# TYPE zio_fiber_starts gauge
                     \\
                 , .{
-                    d.sched.switches,       d.sched.live,          d.sched.ready,
-                    d.sched.parked,         d.sched.futex_waiters, d.sched.timers,
-                    d.sched.inject_pending, d.sched.free_list,     d.poller_registrations,
-                    d.dns_queued,           d.dns_workers,         d.dns_idle,
+                    d.sched.switches,       d.sched.live,           d.sched.ready,
+                    d.sched.parked,         d.sched.futex_waiters,  d.sched.timers,
+                    d.sched.inject_pending, d.sched.free_list,      d.poller_registrations,
+                    d.sched.arm_failures,   d.sched.last_arm_errno, d.dns_queued,
+                    d.dns_workers,          d.dns_idle,
                 }) catch "";
                 var total = base_body.len;
                 if (total + extra.len <= metrics_buf.len) {