The Alertmanager handles alerts sent by client applications such as the Prometheus server. It takes care of deduplicating, grouping, and routing them to the correct receiver integrations such as email, PagerDuty, OpsGenie, or many other mechanisms thanks to the webhook receiver. It also takes care of silencing and inhibition of alerts.
There are various ways of installing Alertmanager.
Precompiled binaries for released versions are available in the download section on prometheus.io. Using the latest production release binary is the recommended way of installing Alertmanager.
Docker images are available on Quay.io or Docker Hub.
You can launch an Alertmanager container for trying it out with
$ docker run --name alertmanager -d -p 127.0.0.1:9093:9093 quay.io/prometheus/alertmanager
Alertmanager will now be reachable at http://localhost:9093/.
You can either go get it:
$ GO15VENDOREXPERIMENT=1 go get github.com/prometheus/alertmanager/cmd/...
# cd $GOPATH/src/github.com/prometheus/alertmanager
$ alertmanager --config.file=<your_file>
Or clone the repository and build manually:
$ mkdir -p $GOPATH/src/github.com/prometheus
$ cd $GOPATH/src/github.com/prometheus
$ git clone https://github.com/prometheus/alertmanager.git
$ cd alertmanager
$ make build
$ ./alertmanager --config.file=<your_file>
You can also build just one of the binaries in this repo by passing a name to the build function:
$ make build BINARIES=amtool
This is an example configuration that should cover most relevant aspects of the new YAML configuration format. The full documentation of the configuration can be found here.
global:
# The smarthost and SMTP sender used for mail notifications.
smtp_smarthost: 'localhost:25'
smtp_from: '[email protected]'
# The root route on which each incoming alert enters.
route:
# The root route must not have any matchers as it is the entry point for
# all alerts. It needs to have a receiver configured so alerts that do not
# match any of the sub-routes are sent to someone.
receiver: 'team-X-mails'
# The labels by which incoming alerts are grouped together. For example,
# multiple alerts coming in for cluster=A and alertname=LatencyHigh would
# be batched into a single group.
#
# To aggregate by all possible labels use '...' as the sole label name.
# This effectively disables aggregation entirely, passing through all
# alerts as-is. This is unlikely to be what you want, unless you have
# a very low alert volume or your upstream notification system performs
# its own grouping. Example: group_by: [...]
group_by: ['alertname', 'cluster']
# When a new group of alerts is created by an incoming alert, wait at
# least 'group_wait' to send the initial notification.
# This way ensures that you get multiple alerts for the same group that start
# firing shortly after another are batched together on the first
# notification.
group_wait: 30s
# When the first notification was sent, wait 'group_interval' to send a batch
# of new alerts that started firing for that group.
group_interval: 5m
# If an alert has successfully been sent, wait 'repeat_interval' to
# resend them.
repeat_interval: 3h
# All the above attributes are inherited by all child routes and can
# overwritten on each.
# The child route trees.
routes:
# This route performs a regular expression match on alert labels to
# catch alerts that are related to a list of services.
- matchers:
- service=~"^(foo1|foo2|baz)$"
receiver: team-X-mails
# The service has a sub-route for critical alerts, any alerts
# that do not match, i.e. severity != critical, fall-back to the
# parent node and are sent to 'team-X-mails'
routes:
- matchers:
- severity="critical"
receiver: team-X-pager
- matchers:
- service="files"
receiver: team-Y-mails
routes:
- matchers:
- severity="critical"
receiver: team-Y-pager
# This route handles all alerts coming from a database service. If there's
# no team to handle it, it defaults to the DB team.
- matchers:
- service="database"
receiver: team-DB-pager
# Also group alerts by affected database.
group_by: [alertname, cluster, database]
routes:
- matchers:
- owner="team-X"
receiver: team-X-pager
- matchers:
- owner="team-Y"
receiver: team-Y-pager
# Inhibition rules allow to mute a set of alerts given that another alert is
# firing.
# We use this to mute any warning-level notifications if the same alert is
# already critical.
inhibit_rules:
- source_matchers:
- severity="critical"
target_matchers:
- severity="warning"
# Apply inhibition if the alertname is the same.
# CAUTION:
# If all label names listed in `equal` are missing
# from both the source and target alerts,
# the inhibition rule will apply!
equal: ['alertname']
receivers:
- name: 'team-X-mails'
email_configs:
- to: '[email protected], [email protected]'
- name: 'team-X-pager'
email_configs:
- to: '[email protected]'
pagerduty_configs:
- routing_key: <team-X-key>
- name: 'team-Y-mails'
email_configs:
- to: '[email protected]'
- name: 'team-Y-pager'
pagerduty_configs:
- routing_key: <team-Y-key>
- name: 'team-DB-pager'
pagerduty_configs:
- routing_key: <team-DB-key>The current Alertmanager API is version 2. This API is fully generated via the OpenAPI project and Go Swagger with the exception of the HTTP handlers themselves. The API specification can be found in api/v2/openapi.yaml. A HTML rendered version can be accessed here. Clients can be easily generated via any OpenAPI generator for all major languages.
With the default config, endpoints are accessed under a /api/v1 or /api/v2 prefix.
The v2 /status endpoint would be /api/v2/status. If --web.route-prefix is set then API routes are
prefixed with that as well, so --web.route-prefix=/alertmanager/ would
relate to /alertmanager/api/v2/status.
API v2 is still under heavy development and thereby subject to change.
amtool is a cli tool for interacting with the Alertmanager API. It is bundled with all releases of Alertmanager.
Alternatively you can install with:
$ go install github.com/prometheus/alertmanager/cmd/amtool@latest
View all currently firing alerts:
$ amtool alert
Alertname Starts At Summary
Test_Alert 2017-08-02 18:30:18 UTC This is a testing alert!
Test_Alert 2017-08-02 18:30:18 UTC This is a testing alert!
Check_Foo_Fails 2017-08-02 18:30:18 UTC This is a testing alert!
Check_Foo_Fails 2017-08-02 18:30:18 UTC This is a testing alert!
View all currently firing alerts with extended output:
$ amtool -o extended alert
Labels Annotations Starts At Ends At Generator URL
alertname="Test_Alert" instance="node0" link="https://example.com" summary="This is a testing alert!" 2017-08-02 18:31:24 UTC 0001-01-01 00:00:00 UTC http://my.testing.script.local
alertname="Test_Alert" instance="node1" link="https://example.com" summary="This is a testing alert!" 2017-08-02 18:31:24 UTC 0001-01-01 00:00:00 UTC http://my.testing.script.local
alertname="Check_Foo_Fails" instance="node0" link="https://example.com" summary="This is a testing alert!" 2017-08-02 18:31:24 UTC 0001-01-01 00:00:00 UTC http://my.testing.script.local
alertname="Check_Foo_Fails" instance="node1" link="https://example.com" summary="This is a testing alert!" 2017-08-02 18:31:24 UTC 0001-01-01 00:00:00 UTC http://my.testing.script.local
In addition to viewing alerts, you can use the rich query syntax provided by Alertmanager:
$ amtool -o extended alert query alertname="Test_Alert"
Labels Annotations Starts At Ends At Generator URL
alertname="Test_Alert" instance="node0" link="https://example.com" summary="This is a testing alert!" 2017-08-02 18:31:24 UTC 0001-01-01 00:00:00 UTC http://my.testing.script.local
alertname="Test_Alert" instance="node1" link="https://example.com" summary="This is a testing alert!" 2017-08-02 18:31:24 UTC 0001-01-01 00:00:00 UTC http://my.testing.script.local
$ amtool -o extended alert query instance=~".+1"
Labels Annotations Starts At Ends At Generator URL
alertname="Test_Alert" instance="node1" link="https://example.com" summary="This is a testing alert!" 2017-08-02 18:31:24 UTC 0001-01-01 00:00:00 UTC http://my.testing.script.local
alertname="Check_Foo_Fails" instance="node1" link="https://example.com" summary="This is a testing alert!" 2017-08-02 18:31:24 UTC 0001-01-01 00:00:00 UTC http://my.testing.script.local
$ amtool -o extended alert query alertname=~"Test.*" instance=~".+1"
Labels Annotations Starts At Ends At Generator URL
alertname="Test_Alert" instance="node1" link="https://example.com" summary="This is a testing alert!" 2017-08-02 18:31:24 UTC 0001-01-01 00:00:00 UTC http://my.testing.script.local
Silence an alert:
$ amtool silence add alertname=Test_Alert
b3ede22e-ca14-4aa0-932c-ca2f3445f926
$ amtool silence add alertname="Test_Alert" instance=~".+0"
e48cb58a-0b17-49ba-b734-3585139b1d25
View silences:
$ amtool silence query
ID Matchers Ends At Created By Comment
b3ede22e-ca14-4aa0-932c-ca2f3445f926 alertname=Test_Alert 2017-08-02 19:54:50 UTC kellel
$ amtool silence query instance=~".+0"
ID Matchers Ends At Created By Comment
e48cb58a-0b17-49ba-b734-3585139b1d25 alertname=Test_Alert instance=~.+0 2017-08-02 22:41:39 UTC kellel
Expire a silence:
$ amtool silence expire b3ede22e-ca14-4aa0-932c-ca2f3445f926
Expire all silences matching a query:
$ amtool silence query instance=~".+0"
ID Matchers Ends At Created By Comment
e48cb58a-0b17-49ba-b734-3585139b1d25 alertname=Test_Alert instance=~.+0 2017-08-02 22:41:39 UTC kellel
$ amtool silence expire $(amtool silence query -q instance=~".+0")
$ amtool silence query instance=~".+0"
Expire all silences:
$ amtool silence expire $(amtool silence query -q)
Try out how a template works. Let's say you have this in your configuration file:
templates:
- '/foo/bar/*.tmpl'
Then you can test out how a template would look like with example by using this command:
amtool template render --template.glob='/foo/bar/*.tmpl' --template.text='{{ template "slack.default.markdown.v1" . }}'
amtool allows a configuration file to specify some options for convenience. The default configuration file paths are $HOME/.config/amtool/config.yml or /etc/amtool/config.yml
An example configuration file might look like the following:
# Define the path that `amtool` can find your `alertmanager` instance
alertmanager.url: "http://localhost:9093"
# Override the default author. (unset defaults to your username)
author: [email protected]
# Force amtool to give you an error if you don't include a comment on a silence
comment_required: true
# Set a default output format. (unset defaults to simple)
output: extended
# Set a default receiver
receiver: team-X-pager
amtool allows you to visualize the routes of your configuration in form of text tree view.
Also you can use it to test the routing by passing it label set of an alert
and it prints out all receivers the alert would match ordered and separated by ,.
(If you use --verify.receivers amtool returns error code 1 on mismatch)
Example of usage:
# View routing tree of remote Alertmanager
$ amtool config routes --alertmanager.url=http://localhost:9090
# Test if alert matches expected receiver
$ amtool config routes test --config.file=doc/examples/simple.yml --tree --verify.receivers=team-X-pager service=database owner=team-X
Alertmanager's high availability is in production use at many companies and is enabled by default.
Important: Both UDP and TCP are needed in alertmanager 0.15 and higher for the cluster to work.
- If you are using a firewall, make sure to whitelist the clustering port for both protocols.
- If you are running in a container, make sure to expose the clustering port for both protocols.
To create a highly available cluster of the Alertmanager the instances need to
be configured to communicate with each other. This is configured using the
--cluster.* flags.
--cluster.listen-addressstring: cluster listen address (default "0.0.0.0:9094"; empty string disables HA mode)--cluster.advertise-addressstring: cluster advertise address--cluster.peervalue: initial peers (repeat flag for each additional peer)--cluster.peer-timeoutvalue: peer timeout period (default "15s")--cluster.gossip-intervalvalue: cluster message propagation speed (default "200ms")--cluster.pushpull-intervalvalue: lower values will increase convergence speeds at expense of bandwidth (default "1m0s")--cluster.settle-timeoutvalue: maximum time to wait for cluster connections to settle before evaluating notifications.--cluster.tcp-timeoutvalue: timeout value for tcp connections, reads and writes (default "10s")--cluster.probe-timeoutvalue: time to wait for ack before marking node unhealthy (default "500ms")--cluster.probe-intervalvalue: interval between random node probes (default "1s")--cluster.reconnect-intervalvalue: interval between attempting to reconnect to lost peers (default "10s")--cluster.reconnect-timeoutvalue: length of time to attempt to reconnect to a lost peer (default: "6h0m0s")--cluster.labelvalue: the label is an optional string to include on each packet and stream. It uniquely identifies the cluster and prevents cross-communication issues when sending gossip messages (default:"")
The chosen port in the cluster.listen-address flag is the port that needs to be
specified in the cluster.peer flag of the other peers.
The cluster.advertise-address flag is required if the instance doesn't have
an IP address that is part of RFC 6890
with a default route.
To start a cluster of three peers on your local machine use goreman and the
Procfile within this repository.
goreman start
To point your Prometheus 1.4, or later, instance to multiple Alertmanagers, configure them
in your prometheus.yml configuration file, for example:
alerting:
alertmanagers:
- static_configs:
- targets:
- alertmanager1:9093
- alertmanager2:9093
- alertmanager3:9093Important: Do not load balance traffic between Prometheus and its Alertmanagers, but instead point Prometheus to a list of all Alertmanagers. The Alertmanager implementation expects all alerts to be sent to all Alertmanagers to ensure high availability.
If running Alertmanager in high availability mode is not desired, setting --cluster.listen-address= prevents Alertmanager from listening to incoming peer requests.
Check the Prometheus contributing page.
To contribute to the user interface, refer to ui/app/CONTRIBUTING.md.
Apache License 2.0, see LICENSE.