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[中文 ](prometheus-cn.md )
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# prometheus
This plugin exposes metrics in Prometheus Exposition format.
## Attributes
none.
## How to enable it
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`prometheus` plugin can be enable with empty table, because it doesn't have
any options yet.
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For example:
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
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{
"uri": "/hello",
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"plugins": {
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"prometheus":{}
},
"upstream": {
"type": "roundrobin",
"nodes": {
"127.0.0.1:80": 1
}
}
}'
```
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You can open dashboard with a browser: `http://127.0.0.1:9080/apisix/dashboard/` , to complete the above operation through the web interface, first add a route:
![](../images/plugin/prometheus-1.png)
Then add prometheus plugin:
![](../images/plugin/prometheus-2.png)
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## How to fetch the metric data
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We fetch the metric data from the specified url `/apisix/prometheus/metrics` .
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Puts this uri address into prometheus, and it will automatically fetch
these metric data.
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For example like this:
```yaml
scrape_configs:
- job_name: 'apisix'
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metrics_path: '/apisix/prometheus/metrics'
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static_configs:
- targets: ['127.0.0.1:9080']
```
And we can check the status at prometheus console:
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![](../../doc/images/plugin/prometheus01.png)
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![](../../doc/images/plugin/prometheus02.png)
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### Grafana dashboard
Metrics exported by the plugin can be graphed in Grafana using a drop in dashboard: https://grafana.com/dashboards/7424 .
### Available metrics
* `Status codes` : HTTP status codes returned by upstream services. These are available per service and across all services.
* `Bandwidth` : Total Bandwidth (egress/ingress) flowing through apisix. This metric is available per service and as a sum across all services.
* `etcd reachability` : A gauge type with a value of 0 or 1, representing if etcd can be reached by a apisix or not.
* `Connections` : Various Nginx connection metrics like active, reading, writing, and number of accepted connections.
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Here is the original metric data of apisix:
```
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$ curl http://127.0.0.2:9080/apisix/prometheus/metrics
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# HELP apisix_bandwidth Total bandwidth in bytes consumed per service in Apisix
# TYPE apisix_bandwidth counter
apisix_bandwidth{type="egress",service="127.0.0.2"} 183
apisix_bandwidth{type="egress",service="bar.com"} 183
apisix_bandwidth{type="egress",service="foo.com"} 2379
apisix_bandwidth{type="ingress",service="127.0.0.2"} 83
apisix_bandwidth{type="ingress",service="bar.com"} 76
apisix_bandwidth{type="ingress",service="foo.com"} 988
# HELP apisix_etcd_reachable Config server etcd reachable from Apisix, 0 is unreachable
# TYPE apisix_etcd_reachable gauge
apisix_etcd_reachable 1
# HELP apisix_http_status HTTP status codes per service in Apisix
# TYPE apisix_http_status counter
apisix_http_status{code="200",service="127.0.0.2"} 1
apisix_http_status{code="200",service="bar.com"} 1
apisix_http_status{code="200",service="foo.com"} 13
# HELP apisix_nginx_http_current_connections Number of HTTP connections
# TYPE apisix_nginx_http_current_connections gauge
apisix_nginx_http_current_connections{state="accepted"} 11994
apisix_nginx_http_current_connections{state="active"} 2
apisix_nginx_http_current_connections{state="handled"} 11994
apisix_nginx_http_current_connections{state="reading"} 0
apisix_nginx_http_current_connections{state="total"} 1191780
apisix_nginx_http_current_connections{state="waiting"} 1
apisix_nginx_http_current_connections{state="writing"} 1
# HELP apisix_nginx_metric_errors_total Number of nginx-lua-prometheus errors
# TYPE apisix_nginx_metric_errors_total counter
apisix_nginx_metric_errors_total 0
```