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Data Collection &
Prometheus Scraping
with Sensu 2.0
Co-Founder & CTO, Sensu Inc.
Sean Porter
InfluxDays 2018
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● Sean Porter
● Author of Sensu
● CTO for Sensu Inc.
● @portertech
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We solve our problems
with technology.
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We create new problems
with technology.
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Illustration by Fredrik Skarstedt
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HOST
APP APP APP APP
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HOST
VM VM
APP APP APP APP
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HOST
VM VM
APP APP APP APP
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COMPLEXITY
TIME
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Apps can span any
number of technologies.
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+
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Design
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{
timestamp: 1516663186,
entity: { … },
check: { … },
metrics: { ... }
}
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● Backend REST API
● sensuctl (CLI tool)
● Dashboard
Configuration
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● RBAC
● Organization
● Environment
Configuration
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3 Methods
The three methods of data collection with Sensu.
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1. Service Checks
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● Script
● STDOUT (message and data)
● Exit code (severity)
Service Checks
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check_mysql -H localhost -P 3360
Uptime: 798 Threads: 1 Questions: 5 Slow queries: 0
Opens: 107 Flush tables: 1 Open tables: 26 Queries per
second avg: 0.006|Connections=9c;;; Open_files=6;;;
Open_tables=27;;; Qcache_free_memory=16760152;;;
Qcache_hits=0c;;; Qcache_inserts=0c;;;
Qcache_lowmem_prunes=0c;;; Qcache_not_cached=1c;;;
Qcache_queries_in_cache=0;;; Queries=6c;;; Questions=4c;;;
Table_locks_waited=0c;;; Threads_connected=1;;;
Threads_running=1;;; Uptime=798c;;;
Exit 0 (OK)
Service Checks
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check_mysql -H localhost -P 3360
Can't connect to MySQL server on 'localhost'
Exit 2 (CRITICAL)
Service Checks
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{
timestamp: 1516663186,
entity: { … },
check: {
command: “check_mysql -H ...”
output: “Can’t connect ... ”,
status: 2,
…
},
metrics: { ... }
}
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Symptoms
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check_mysql -H localhost -P 3360
Uptime: 798 Threads: 1 Questions: 5 Slow queries: 0
Opens: 107 Flush tables: 1 Open tables: 26 Queries per
second avg: 0.006|Connections=9c;;; Open_files=6;;;
Open_tables=27;;; Qcache_free_memory=16760152;;;
Qcache_hits=0c;;; Qcache_inserts=0c;;;
Qcache_lowmem_prunes=0c;;; Qcache_not_cached=1c;;;
Qcache_queries_in_cache=0;;; Queries=6c;;; Questions=4c;;;
Table_locks_waited=0c;;; Threads_connected=1;;;
Threads_running=1;;; Uptime=798c;;;
Exit 0 (OK)
Service Checks
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● Simple
● Accessible
● Shareable
● Legacy
Service Checks
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2. Events API
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● REST API (Agent & Backend)
● Entity management
● External checks
● Metrics
Events API
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POST /events
{
timestamp: 1516663186,
entity: { … },
check: { … },
metrics: { ... }
}
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{
timestamp: 1516663186,
entity: {
name: leviathan,
class: application,
tags: [ … ],
...
},
check: { … },
metrics: { ... }
}
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{
timestamp: 1516663186,
entity: { … },
check: {
output: “Backup failed ... ”,
status: 2,
ttl: 6h,
…
},
metrics: { ... }
}
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{
timestamp: 1516663186,
entity: { … },
check: { … },
metrics: {
handlers: [influxdb],
points: [{
name: mysql.connections,
value: 9,
tags: [ … ]
}]
}
}
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3. StatsD
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● Agent listeners (TCP & UDP)
● Stats aggregation
● Gauges, counters, etc.
● Protocol enhancements (tags)
StatsD
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:|c[|@]
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● Service checks
● Events API
● StatsD
3 Methods Recap
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Prom Scraping
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/metrics
/metrics
/metrics
/metrics
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Demo
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COMPLEXITY
TIME
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+
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Thank You
Co-Founder & CTO, Sensu Inc.
Sean Porter (@portertech)
InfluxDays 2018