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This topic has been translated from a Chinese forum by GPT and might contain errors.
Original topic: Prometheus定义的告警rule文件，定义的DM监控指标是在哪有说明？
As the title suggests, what does the expression [dm_relay_space] mean and where is it defined? Where is this data maintained?
rules:
- alert: DM_remain_storage_of_relay_log
expr: dm_relay_space{type=“available”} < 10102410241024
labels:
env: dm-cluster-prod
level: critical
expr: dm_relay_space{type=“available”} < 10102410241024
annotations:
description: ‘cluster: dm-cluster-prod, instance: {{ $labels.instance }}, values: {{ $value }}’
value: ‘{{ $value }}’
summary: DM remain storage of relay log
Refer to this document and compare it with Grafana monitoring.
The data is stored in Prometheus, and it will periodically pull data from DM.
I don’t understand where keywords like [dm_relay_space] in the configuration are defined? What other such keywords are there?
Are you referring to the code:
relayLogSpaceGauge = metricsproxy.NewGaugeVec(
&promutil.PromFactory{},
prometheus.GaugeOpts{
Namespace: "dm",
Subsystem: "relay",
Name: "space",
Help: "the space of storage for relay component",
}, []string{"type"}) // type can be 'capacity' and 'available'.
The preceding “dm” and “relay” are the same prefix for the namespace, and this metric is defined like this.
What code is this? Is it for DM?
When using it, you shouldn’t need to consider where it is defined, right? Are you going to change the Grafana dashboard configuration or something like that?
I want to modify the alert configuration. The alert condition is determined by [expr: dm_relay_space{type=“available”} < 10 * 1024 * 1024 * 1024]. If I don’t know the meaning of dm_relay_space and what indicators like this are, I can’t make changes.
Understood, it seems there is indeed no relevant documentation. We will consider adding it in the future. 
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