开源监控系统Prometheus——Alertmanager报警模块

概要

Alertmanager与Prometheus是相互分离的两个部分。Prometheus服务器根据报警规则将警报发送给Alertmanager，然后Alertmanager将silencing、inhibition、aggregation等消息通过电子邮件、PaperDuty和HipChat发送通知。

设置警报和通知的主要步骤：
安装配置Alertmanager
配置Prometheus通过

-alertmanager.url

标志与Alertmanager通信
在Prometheus中创建告警规则

Alertmanager简介及机制

Alertmanager处理由类似Prometheus服务器等客户端发来的警报，之后需要删除重复、分组，并将它们通过路由发送到正确的接收器，比如电子邮件、Slack等。Alertmanager还支持沉默和警报抑制的机制。

分组

分组是指当出现问题时，Alertmanager会收到一个单一的通知，而当系统宕机时，很有可能成百上千的警报会同时生成，这种机制在较大的中断中特别有用。

例如，当数十或数百个服务的实例在运行，网络发生故障时，有可能服务实例的一半不可达数据库。在告警规则中配置为每一个服务实例都发送警报的话，那么结果是数百警报被发送至Alertmanager。

但是作为用户只想看到单一的报警页面，同时仍然能够清楚的看到哪些实例受到影响，因此，人们通过配置Alertmanager将警报分组打包，并发送一个相对看起来紧凑的通知。

分组警报、警报时间，以及接收警报的receiver是在配置文件中通过路由树配置的。

抑制

抑制是指当警报发出后，停止重复发送由此警报引发其他错误的警报的机制。

例如，当警报被触发，通知整个集群不可达，可以配置Alertmanager忽略由该警报触发而产生的所有其他警报，这可以防止通知数百或数千与此问题不相关的其他警报。

抑制机制可以通过Alertmanager的配置文件来配置。

沉默

沉默是一种简单的特定时间静音提醒的机制。一种沉默是通过匹配器来配置，就像路由树一样。传入的警报会匹配RE，如果匹配，将不会为此警报发送通知。

沉默机制可以通过Alertmanager的Web页面进行配置。

Alertmanager的配置

Alertmanager通过命令行flag和一个配置文件进行配置。命令行flag配置不变的系统参数、配置文件定义的禁止规则、通知路由和通知接收器。

要查看所有可用的命令行flag，运行

alertmanager -h

。

Alertmanager在运行时加载配置，如果不能很好的形成新的配置，更改将不会被应用，并记录错误。

配置文件

要指定加载的配置文件，需要使用

-config.file

标志。该文件使用YAML来完成，通过下面的描述来定义。括号内的参数是可选的，对于非列表的参数的值设置为指定的缺省值。

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global: # ResolveTimeout is the time after which an alert is declared resolved # if it has not been updated. [ resolve_timeout: <duration> | default = 5m ] # The default SMTP From header field. [ smtp_from: <tmpl_string> ] # The default SMTP smarthost used for sending emails. [ smtp_smarthost: <string> ] # The API URL to use for Slack notifications. [ slack_api_url: <string> ] [ pagerduty_url: <string> | default = "https://events.pagerduty.com/generic/2010-04-15/create_event.json" ] [ opsgenie_api_host: <string> | default = "https://api.opsgenie.com/" ]# Files from which custom notification template definitions are read.# The last component may use a wildcard matcher, e.g. 'templates/*.tmpl'.templates: [ - <filepath> ... ]# The root node of the routing tree.route: <route># A list of notification receivers.receivers: - <receiver> ...# A list of inhibition rules.inhibit_rules: [ - <inhibit_rule> ... ]

路由
route

路由块定义了路由树及其子节点。如果没有设置的话，子节点的可选配置参数从其父节点继承。

每个警报进入配置的路由树的顶级路径，顶级路径必须匹配所有警报（即没有任何形式的匹配）。然后匹配子节点。如果continue的值设置为false，它在匹配第一个孩子后就停止；如果在子节点匹配，continue的值为true，警报将继续进行后续兄弟姐妹的匹配。如果警报不匹配任何节点的任何子节点（没有匹配的子节点，或不存在），该警报基于当前节点的配置处理。

路由配置格式

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[ receiver: <string> ][ group_by: '[' <labelname>, ... ']' ]# Whether an alert should continue matching subsequent sibling nodes.[ continue: <boolean> | default = false ]# A set of equality matchers an alert has to fulfill to match the node.match: [ <labelname>: <labelvalue>, ... ]# A set of regex-matchers an alert has to fulfill to match the node.match_re: [ <labelname>: <regex>, ... ]# How long to initially wait to send a notification for a group# of alerts. Allows to wait for an inhibiting alert to arrive or collect# more initial alerts for the same group. (Usually ~0s to few minutes.)[ group_wait: <duration> ]# How long to wait before sending notification about new alerts that are# in are added to a group of alerts for which an initial notification# has already been sent. (Usually ~5min or more.)[ group_interval: <duration> ]# How long to wait before sending a notification again if it has already# been sent successfully for an alert. (Usually ~3h or more).[ repeat_interval: <duration> ]# Zero or more child routes.routes: [ - <route> ... ]

示例：

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# The root route with all parameters, which are inherited by the child# routes if they are not overwritten.route: receiver: 'default-receiver' group_wait: 30s group_interval: 5m repeat_interval: 4h group_by: [cluster, alertname] # All alerts that do not match the following child routes # will remain at the root node and be dispatched to 'default-receiver'. routes: # All alerts with service=mysql or service=cassandra # are dispatched to the database pager. - receiver: 'database-pager' group_wait: 10s match_re: service: mysql|cassandra # All alerts with the team=frontend label match this sub-route. # They are grouped by product and environment rather than cluster # and alertname. - receiver: 'frontend-pager' group_by: [product, environment] match: team: frontend

抑制规则
inhibit_rule

抑制规则，是存在另一组匹配器匹配的情况下，静音其他被引发警报的规则。这两个警报，必须有一组相同的标签。

抑制配置格式

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# Matchers that have to be fulfilled in the alerts to be muted.target_match: [ <labelname>: <labelvalue>, ... ]target_match_re: [ <labelname>: <regex>, ... ]# Matchers for which one or more alerts have to exist for the# inhibition to take effect.source_match: [ <labelname>: <labelvalue>, ... ]source_match_re: [ <labelname>: <regex>, ... ]# Labels that must have an equal value in the source and target# alert for the inhibition to take effect.[ equal: '[' <labelname>, ... ']' ]

接收器
receiver

顾名思义，警报接收的配置。

通用配置格式

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# The unique name of the receiver.name: <string># Configurations for several notification integrations.email_configs: [ - <email_config>, ... ]pagerduty_configs: [ - <pagerduty_config>, ... ]slack_config: [ - <slack_config>, ... ]opsgenie_configs: [ - <opsgenie_config>, ... ]webhook_configs: [ - <webhook_config>, ... ]

邮件接收器
email_config

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# Whether or not to notify about resolved alerts.[ send_resolved: <boolean> | default = false ]# The email address to send notifications to.to: <tmpl_string># The sender address.[ from: <tmpl_string> | default = global.smtp_from ]# The SMTP host through which emails are sent.[ smarthost: <string> | default = global.smtp_smarthost ]# The HTML body of the email notification.[ html: <tmpl_string> | default = '{{ template "email.default.html" . }}' ] # Further headers email header key/value pairs. Overrides any headers# previously set by the notification implementation.[ headers: { <string>: <tmpl_string>, ... } ]

Slack接收器
slack_config

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# Whether or not to notify about resolved alerts.[ send_resolved: <boolean> | default = true ]# The Slack webhook URL.[ api_url: <string> | default = global.slack_api_url ]# The channel or user to send notifications to.channel: <tmpl_string># API request data as defined by the Slack webhook API.[ color: <tmpl_string> | default = '{{ if eq .Status "firing" }}danger{{ else }}good{{ end }}' ][ username: <tmpl_string> | default = '{{ template "slack.default.username" . }}'[ title: <tmpl_string> | default = '{{ template "slack.default.title" . }}' ][ title_link: <tmpl_string> | default = '{{ template "slack.default.titlelink" . }}' ][ pretext: <tmpl_string> | default = '{{ template "slack.default.pretext" . }}' ][ text: <tmpl_string> | default = '{{ template "slack.default.text" . }}' ][ fallback: <tmpl_string> | default = '{{ template "slack.default.fallback" . }}' ]

Webhook接收器
webhook_config

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# Whether or not to notify about resolved alerts.[ send_resolved: <boolean> | default = true ]# The endpoint to send HTTP POST requests to.url: <string>

Alertmanager会使用以下的格式向配置端点发送HTTP POST请求：

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{ "version": "2", "status": "<resolved|firing>", "alerts": [ { "labels": <object>, "annotations": <object>, "startsAt": "<rfc3339>", "endsAt": "<rfc3339>" }, ... ]}

报警规则

报警规则允许你定义基于Prometheus语言表达的报警条件，并发送报警通知到外部服务。

定义报警规则

报警规则通过以下格式定义：

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ALERT <alert name> IF <expression> [ FOR <duration> ] [ LABELS <label set> ] [ ANNOTATIONS <label set> ]

FOR子句使得Prometheus等待第一个传进来的向量元素（例如高HTTP错误的实例），并计数一个警报。如果元素是active，但是没有firing的，就处于pending状态。

LABELS（标签）子句允许指定一组附加的标签附到警报上。现有的任何标签都会被覆盖，标签值可以被模板化。

ANNOTATIONS（注释）子句指定另一组未查明警报实例的标签，它们被用于存储更长的其他信息，例如警报描述或者链接，注释值可以被模板化。

报警规则示例

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# Alert for any instance that is unreachable for >5 minutes.ALERT InstanceDown IF up == 0 FOR 5m LABELS { severity = "page" } ANNOTATIONS { summary = "Instance {{ $labels.instance }} down", description = "{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 5 minutes.", }# Alert for any instance that have a median request latency >1s.ALERT APIHighRequestLatency IF api_http_request_latencies_second{quantile="0.5"} > 1 FOR 1m ANNOTATIONS { summary = "High request latency on {{ $labels.instance }}", description = "{{ $labels.instance }} has a median request latency above 1s (current value: {{ $value }}s)", }

发送警报通知

Prometheus可以周期性的发送关于警报状态的信息到Alertmanager实例，然后Alertmanager调度来发送正确的通知。该Alertmanager可以通过

-alertmanager.url

命令行flag来配置。

转自 https://sagittariusyx.github.io/2016/03/07/prometheus-alertmanager/