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+
+# make sure we can collect web log data
+
+template: last_collected_secs
+ on: web_log.response_codes
+families: *
+ 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: down 5m multiplier 1.5 max 1h
+ info: number of seconds since the last successful data collection
+ to: webmaster
+
+
+# -----------------------------------------------------------------------------
+# high level response code alarms
+
+# the following alarms trigger only when there are enough data.
+# we assume there are enough data when:
+#
+# $1m_requests > 120
+#
+# i.e. when there are at least 120 requests during the last minute
+
+template: 1m_requests
+ on: web_log.response_statuses
+families: *
+ lookup: sum -1m unaligned
+ calc: ($this == 0)?(1):($this)
+ units: requests
+ every: 10s
+ info: the sum of all HTTP requests over the last minute
+
+template: 1m_successful
+ on: web_log.response_statuses
+families: *
+ lookup: sum -1m unaligned of successful_requests
+ calc: $this * 100 / $1m_requests
+ units: %
+ every: 10s
+ warn: ($1m_requests > 120) ? ($this < (($status >= $WARNING ) ? ( 95 ) : ( 85 )) ) : ( 0 )
+ crit: ($1m_requests > 120) ? ($this < (($status == $CRITICAL) ? ( 85 ) : ( 75 )) ) : ( 0 )
+ delay: up 2m down 15m multiplier 1.5 max 1h
+ info: the ratio of successful HTTP responses (1xx, 2xx, 304) over the last minute
+ to: webmaster
+
+template: 1m_redirects
+ on: web_log.response_statuses
+families: *
+ lookup: sum -1m unaligned of redirects
+ calc: $this * 100 / $1m_requests
+ units: %
+ every: 10s
+ warn: ($1m_requests > 120) ? ($this > (($status >= $WARNING ) ? ( 1 ) : ( 20 )) ) : ( 0 )
+ crit: ($1m_requests > 120) ? ($this > (($status == $CRITICAL) ? ( 20 ) : ( 30 )) ) : ( 0 )
+ delay: up 2m down 15m multiplier 1.5 max 1h
+ info: the ratio of HTTP redirects (3xx except 304) over the last minute
+ to: webmaster
+
+template: 1m_bad_requests
+ on: web_log.response_statuses
+families: *
+ lookup: sum -1m unaligned of bad_requests
+ calc: $this * 100 / $1m_requests
+ units: %
+ every: 10s
+ warn: ($1m_requests > 120) ? ($this > (($status >= $WARNING) ? ( 10 ) : ( 30 )) ) : ( 0 )
+ crit: ($1m_requests > 120) ? ($this > (($status == $CRITICAL) ? ( 30 ) : ( 50 )) ) : ( 0 )
+ delay: up 2m down 15m multiplier 1.5 max 1h
+ info: the ratio of HTTP bad requests (4xx) over the last minute
+ to: webmaster
+
+template: 1m_internal_errors
+ on: web_log.response_statuses
+families: *
+ lookup: sum -1m unaligned of server_errors
+ calc: $this * 100 / $1m_requests
+ units: %
+ every: 10s
+ warn: ($1m_requests > 120) ? ($this > (($status >= $WARNING) ? ( 1 ) : ( 2 )) ) : ( 0 )
+ crit: ($1m_requests > 120) ? ($this > (($status == $CRITICAL) ? ( 2 ) : ( 5 )) ) : ( 0 )
+ delay: up 2m down 15m multiplier 1.5 max 1h
+ info: the ratio of HTTP internal server errors (5xx), over the last minute
+ to: webmaster
+
+# unmatched lines
+
+# the following alarms trigger only when there are enough data.
+# we assume there are enough data when:
+#
+# $1m_total_requests > 120
+#
+# i.e. when there are at least 120 requests during the last minute
+
+template: 1m_total_requests
+ on: web_log.response_codes
+families: *
+ lookup: sum -1m unaligned
+ calc: ($this == 0)?(1):($this)
+ units: requests
+ every: 10s
+ info: the sum of all HTTP requests over the last minute
+
+template: 1m_unmatched
+on: web_log.response_codes
+families: *
+ lookup: sum -1m unaligned of unmatched
+ calc: $this * 100 / $1m_total_requests
+ units: %
+ every: 10s
+ warn: ($1m_total_requests > 120) ? ($this > 1) : ( 0 )
+ crit: ($1m_total_requests > 120) ? ($this > 5) : ( 0 )
+ delay: up 1m down 5m multiplier 1.5 max 1h
+ info: the ratio of unmatched lines, over the last minute
+ to: webmaster
+
+# -----------------------------------------------------------------------------
+# web slow
+
+# the following alarms trigger only when there are enough data.
+# we assume there are enough data when:
+#
+# $1m_requests > 120
+#
+# i.e. when there are at least 120 requests during the last minute
+
+template: 10m_response_time
+ on: web_log.response_time
+families: *
+ lookup: average -10m unaligned of avg
+ units: ms
+ every: 30s
+ info: the average time to respond to HTTP requests, over the last 10 minutes
+
+template: web_slow
+ on: web_log.response_time
+families: *
+ lookup: average -1m unaligned of avg
+ units: ms
+ every: 10s
+ green: 500
+ red: 1000
+ warn: ($1m_requests > 120) ? ($this > $green && $this > ($10m_response_time * 2) ) : ( 0 )
+ crit: ($1m_requests > 120) ? ($this > $red && $this > ($10m_response_time * 4) ) : ( 0 )
+ delay: down 15m multiplier 1.5 max 1h
+ info: the average time to respond to HTTP requests, over the last 1 minute
+ options: no-clear-notification
+ to: webmaster
+
+# -----------------------------------------------------------------------------
+# web too many or too few requests
+
+# the following alarms trigger only when there are enough data.
+# we assume there are enough data when:
+#
+# $5m_successful_old > 120
+#
+# i.e. when there were at least 120 requests during the 5 minutes starting
+# at -10m and ending at -5m
+
+template: 5m_successful_old
+ on: web_log.response_statuses
+families: *
+ lookup: average -5m at -5m unaligned of successful_requests
+ units: requests/s
+ every: 30s
+ info: average rate of successful HTTP requests over the last 5 minutes
+
+template: 5m_successful
+ on: web_log.response_statuses
+families: *
+ lookup: average -5m unaligned of successful_requests
+ units: requests/s
+ every: 30s
+ info: average successful HTTP requests over the last 5 minutes
+
+template: 5m_requests_ratio
+ on: web_log.response_codes
+families: *
+ calc: ($5m_successful_old > 0)?($5m_successful * 100 / $5m_successful_old):(100)
+ units: %
+ every: 30s
+ warn: ($5m_successful_old > 120) ? ($this > 200 OR $this < 50) : (0)
+ crit: ($5m_successful_old > 120) ? ($this > 400 OR $this < 25) : (0)
+ delay: down 15m multiplier 1.5 max 1h
+options: no-clear-notification
+ info: the percentage of successful web requests over the last 5 minutes, \
+ compared with the previous 5 minutes \
+ (clear notification for this alarm will not be sent)
+ to: webmaster
+