1 files changed, 67 insertions, 0 deletions
diff --git a/health/health.d/tcp_resets.conf b/health/health.d/tcp_resets.conf
new file mode 100644
index 000000000..91dad3c6a
--- /dev/null
+++ b/health/health.d/tcp_resets.conf
@@ -0,0 +1,67 @@
+
+# you can disable an alarm notification by setting the 'to' line to: silent
+
+# -----------------------------------------------------------------------------
+
+   alarm: ipv4_tcphandshake_last_collected_secs
+      on: ipv4.tcphandshake
+      os: linux freebsd
+   hosts: *
+    calc: $now - $last_collected_t
+   units: seconds ago
+   every: 10s
+    warn: $this > (($status >= $WARNING)  ? ($update_every) : ( 5 * $update_every))
+    crit: $this > (($status == $CRITICAL) ? ($update_every) : (60 * $update_every))
+   delay: up 0 down 5m multiplier 1.5 max 1h
+    info: number of seconds since the last successful data collection
+      to: sysadmin
+
+# -----------------------------------------------------------------------------
+# tcp resets this host sends
+
+   alarm: 1m_ipv4_tcp_resets_sent
+      on: ipv4.tcphandshake
+      os: linux
+   hosts: *
+  lookup: average -1m at -10s unaligned absolute of OutRsts
+   units: tcp resets/s
+   every: 10s
+    info: average TCP RESETS this host is sending, over the last minute
+
+   alarm: 10s_ipv4_tcp_resets_sent
+      on: ipv4.tcphandshake
+      os: linux
+   hosts: *
+  lookup: average -10s unaligned absolute of OutRsts
+   units: tcp resets/s
+   every: 10s
+    warn: $this > ((($1m_ipv4_tcp_resets_sent < 5)?(5):($1m_ipv4_tcp_resets_sent)) * (($status >= $WARNING)  ? (1) : (20)))
+   delay: up 0 down 60m multiplier 1.2 max 2h
+ options: no-clear-notification
+    info: average TCP RESETS this host is sending, over the last 10 seconds (this can be an indication that a port scan is made, or that a service running on this host has crashed; clear notification for this alarm will not be sent)
+      to: sysadmin
+
+# -----------------------------------------------------------------------------
+# tcp resets this host receives
+
+   alarm: 1m_ipv4_tcp_resets_received
+      on: ipv4.tcphandshake
+      os: linux freebsd
+   hosts: *
+  lookup: average -1m at -10s unaligned absolute of AttemptFails
+   units: tcp resets/s
+   every: 10s
+    info: average TCP RESETS this host is sending, over the last minute
+
+   alarm: 10s_ipv4_tcp_resets_received
+      on: ipv4.tcphandshake
+      os: linux freebsd
+   hosts: *
+  lookup: average -10s unaligned absolute of AttemptFails
+   units: tcp resets/s
+   every: 10s
+    warn: $this > ((($1m_ipv4_tcp_resets_received < 5)?(5):($1m_ipv4_tcp_resets_received)) * (($status >= $WARNING)  ? (1) : (10)))
+   delay: up 0 down 60m multiplier 1.2 max 2h
+ options: no-clear-notification
+    info: average TCP RESETS this host is receiving, over the last 10 seconds (this can be an indication that a service this host needs, has crashed; clear notification for this alarm will not be sent)
+      to: sysadmin