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docs(inputs.influxdb): Collect v2 with prometheus plugin (#12492)

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plugins/inputs/influxdb/README.md
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# InfluxDB Input Plugin # InfluxDB Input Plugin
The InfluxDB plugin will collect metrics on the given InfluxDB servers. Read The InfluxDB plugin will collect metrics on the given InfluxDB v1 servers from
our [documentation][1] for detailed information about `influxdb` metrics. the `/debug/vars` endpoint. Read the [documentation][1] for detailed
information about `influxdb` metrics. For InfluxDB v2 and the `metrics`
endpoint please see the section below.
This plugin can also gather metrics from endpoints that expose This plugin can also gather metrics from endpoints that expose
InfluxDB-formatted endpoints. See below for more information. InfluxDB-formatted endpoints. See below for more information.
[1]: https://docs.influxdata.com/platform/monitoring/influxdata-platform/tools/measurements-internal/ [1]: https://docs.influxdata.com/platform/monitoring/influxdata-platform/tools/measurements-internal/
## InfluxDB v2 Metrics
For [InfluxDB v2 metrics][2] are produced in Prometheus plain-text format. To
collect metrics at the new `/metrics` endpoint, please use the Prometheus
input plugin. This is an example to collect from a local database:
```toml
[[inputs.prometheus]]
urls = ["http://localhost:8086/metrics"]
metric_version = 1
```
[2]: https://docs.influxdata.com/influxdb/latest/reference/internals/metrics/
## Global configuration options <!-- @/docs/includes/plugin_config.md --> ## Global configuration options <!-- @/docs/includes/plugin_config.md -->
In addition to the plugin-specific configuration settings, plugins support In addition to the plugin-specific configuration settings, plugins support
@ -47,7 +63,7 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
timeout = "5s" timeout = "5s"
``` ```
## Measurements & Fields ## Metrics
**Note:** The measurements and fields included in this plugin are dynamically **Note:** The measurements and fields included in this plugin are dynamically
built from the InfluxDB source, and may vary between versions: built from the InfluxDB source, and may vary between versions: