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-rw-r--r--health/health.d/tcp_resets.conf67
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diff --git a/health/health.d/tcp_resets.conf b/health/health.d/tcp_resets.conf
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+
+# 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 20s 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 20s 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