108 lines
4.2 KiB
Markdown
108 lines
4.2 KiB
Markdown
# Prometheus Input Plugin
|
|
|
|
The prometheus input plugin gathers metrics from HTTP servers exposing metrics
|
|
in Prometheus format.
|
|
|
|
### Configuration:
|
|
|
|
```toml
|
|
# Read metrics from one or many prometheus clients
|
|
[[inputs.prometheus]]
|
|
## An array of urls to scrape metrics from.
|
|
urls = ["http://localhost:9100/metrics"]
|
|
|
|
## An array of Kubernetes services to scrape metrics from.
|
|
# kubernetes_services = ["http://my-service-dns.my-namespace:9100/metrics"]
|
|
|
|
## Use bearer token for authorization
|
|
# bearer_token = /path/to/bearer/token
|
|
|
|
## Specify timeout duration for slower prometheus clients (default is 3s)
|
|
# response_timeout = "3s"
|
|
|
|
## Optional TLS Config
|
|
# tls_ca = /path/to/cafile
|
|
# tls_cert = /path/to/certfile
|
|
# tls_key = /path/to/keyfile
|
|
## Use TLS but skip chain & host verification
|
|
# insecure_skip_verify = false
|
|
```
|
|
|
|
`urls` can contain a unix socket as well. If a different path is required (default is `/metrics` for both http[s] and unix) for a unix socket, add `path` as a query parameter as follows: `unix:///var/run/prometheus.sock?path=/custom/metrics`
|
|
|
|
#### Kubernetes Service Discovery
|
|
|
|
URLs listed in the `kubernetes_services` parameter will be expanded
|
|
by looking up all A records assigned to the hostname as described in
|
|
[Kubernetes DNS service discovery](https://kubernetes.io/docs/concepts/services-networking/service/#dns).
|
|
|
|
This method can be used to locate all
|
|
[Kubernetes headless services](https://kubernetes.io/docs/concepts/services-networking/service/#headless-services).
|
|
|
|
#### Bearer Token
|
|
|
|
If set, the file specified by the `bearer_token` parameter will be read on
|
|
each interval and its contents will be appended to the Bearer string in the
|
|
Authorization header.
|
|
|
|
### Usage for Caddy HTTP server
|
|
|
|
If you want to monitor Caddy, you need to use Caddy with its Prometheus plugin:
|
|
|
|
* Download Caddy+Prometheus plugin [here](https://caddyserver.com/download/linux/amd64?plugins=http.prometheus)
|
|
* Add the `prometheus` directive in your `CaddyFile`
|
|
* Restart Caddy
|
|
* Configure Telegraf to fetch metrics on it:
|
|
|
|
```
|
|
[[inputs.prometheus]]
|
|
# ## An array of urls to scrape metrics from.
|
|
urls = ["http://localhost:9180/metrics"]
|
|
```
|
|
|
|
> This is the default URL where Caddy Prometheus plugin will send data.
|
|
> For more details, please read the [Caddy Prometheus documentation](https://github.com/miekg/caddy-prometheus/blob/master/README.md).
|
|
|
|
### Metrics:
|
|
|
|
Measurement names are based on the Metric Family and tags are created for each
|
|
label. The value is added to a field named based on the metric type.
|
|
|
|
All metrics receive the `url` tag indicating the related URL specified in the
|
|
Telegraf configuration. If using Kubernetes service discovery the `address`
|
|
tag is also added indicating the discovered ip address.
|
|
|
|
### Example Output:
|
|
|
|
**Source**
|
|
```
|
|
# HELP go_gc_duration_seconds A summary of the GC invocation durations.
|
|
# TYPE go_gc_duration_seconds summary
|
|
go_gc_duration_seconds{quantile="0"} 7.4545e-05
|
|
go_gc_duration_seconds{quantile="0.25"} 7.6999e-05
|
|
go_gc_duration_seconds{quantile="0.5"} 0.000277935
|
|
go_gc_duration_seconds{quantile="0.75"} 0.000706591
|
|
go_gc_duration_seconds{quantile="1"} 0.000706591
|
|
go_gc_duration_seconds_sum 0.00113607
|
|
go_gc_duration_seconds_count 4
|
|
# HELP go_goroutines Number of goroutines that currently exist.
|
|
# TYPE go_goroutines gauge
|
|
go_goroutines 15
|
|
# HELP cpu_usage_user Telegraf collected metric
|
|
# TYPE cpu_usage_user gauge
|
|
cpu_usage_user{cpu="cpu0"} 1.4112903225816156
|
|
cpu_usage_user{cpu="cpu1"} 0.702106318955865
|
|
cpu_usage_user{cpu="cpu2"} 2.0161290322588776
|
|
cpu_usage_user{cpu="cpu3"} 1.5045135406226022
|
|
```
|
|
|
|
**Output**
|
|
```
|
|
go_gc_duration_seconds,url=http://example.org:9273/metrics 1=0.001336611,count=14,sum=0.004527551,0=0.000057965,0.25=0.000083812,0.5=0.000286537,0.75=0.000365303 1505776733000000000
|
|
go_goroutines,url=http://example.org:9273/metrics gauge=21 1505776695000000000
|
|
cpu_usage_user,cpu=cpu0,url=http://example.org:9273/metrics gauge=1.513622603430151 1505776751000000000
|
|
cpu_usage_user,cpu=cpu1,url=http://example.org:9273/metrics gauge=5.829145728641773 1505776751000000000
|
|
cpu_usage_user,cpu=cpu2,url=http://example.org:9273/metrics gauge=2.119071644805144 1505776751000000000
|
|
cpu_usage_user,cpu=cpu3,url=http://example.org:9273/metrics gauge=1.5228426395944945 1505776751000000000
|
|
```
|