88 lines
2.8 KiB
Plaintext
88 lines
2.8 KiB
Plaintext
[[xpack-alerting]]
|
|
= Alerting on Cluster and Index Events
|
|
|
|
:imagesdir: images/watcher
|
|
|
|
[partintro]
|
|
--
|
|
You can watch for changes or anomalies in your data and perform the necessary
|
|
actions in response. For example, you might want to:
|
|
|
|
* Monitor social media as another way to detect failures in user-facing
|
|
automated systems like ATMs or ticketing systems. When the number of tweets
|
|
and posts in an area exceeds a threshold of significance, notify a service
|
|
technician.
|
|
|
|
* Monitor your infrastructure, tracking disk usage over time. Open a helpdesk
|
|
ticket when any servers are likely to run out of free space in the next few
|
|
days.
|
|
|
|
* Track network activity to detect malicious activity, and proactively change
|
|
firewall configuration to reject the malicious user.
|
|
|
|
* Monitor Elasticsearch, and send immediate notification to the system
|
|
administrator if nodes leave the cluster or query throughput exceeds an
|
|
expected range.
|
|
|
|
* Track application response times and if page-load time exceeds SLAs for more
|
|
than 5 minutes, open a helpdesk ticket. If SLAs are exceeded for an hour,
|
|
page the administrator on duty.
|
|
|
|
All of these use-cases share a few key properties:
|
|
|
|
* The relevant data or changes in data can be identified with a periodic
|
|
Elasticsearch query.
|
|
|
|
* The results of the query can be checked against a condition.
|
|
|
|
* One or more actions are taken if the condition is true -- an email is sent, a
|
|
3rd party system is notified, or the query results are stored.
|
|
|
|
[float]
|
|
=== How Watches Work
|
|
|
|
{xpack} provides an API for creating, managing and testing _watches_. A watch
|
|
describes a single alert and can contain multiple notification actions.
|
|
|
|
A watch is constructed from four simple building blocks:
|
|
|
|
Schedule:: A schedule for running a query and checking the condition.
|
|
|
|
Query:: The query to run as input to the condition. Watches
|
|
support the full Elasticsearch query language, including
|
|
aggregations.
|
|
|
|
Condition:: A condition that determines whether or not to execute the actions.
|
|
You can use simple conditions (always true), or use scripting for
|
|
more sophisticated scenarios.
|
|
|
|
Actions:: One or more actions, such as sending email, pushing data to
|
|
3rd party systems through a webhook, or indexing the results of
|
|
the query.
|
|
|
|
A full history of all watches is maintained in an Elasticsearch index. This
|
|
history keeps track of each time a watch is triggered and records the results
|
|
from the query, whether the condition was met, and what actions were taken.
|
|
|
|
--
|
|
|
|
include::getting-started.asciidoc[]
|
|
|
|
include::how-watcher-works.asciidoc[]
|
|
|
|
include::input.asciidoc[]
|
|
|
|
include::trigger.asciidoc[]
|
|
|
|
include::condition.asciidoc[]
|
|
|
|
include::actions.asciidoc[]
|
|
|
|
include::transform.asciidoc[]
|
|
|
|
include::java.asciidoc[]
|
|
|
|
include::managing-watches.asciidoc[]
|
|
|
|
include::example-watches.asciidoc[]
|