telegraf/plugins/inputs/prometheus/README.md

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# Prometheus Input Plugin
The prometheus input plugin gathers metrics from any webpage
exposing metrics with Prometheus format
### Configuration:
Example for Kubernetes apiserver
```toml
# Get all metrics from Kube-apiserver
[[inputs.prometheus]]
# An array of urls to scrape metrics from.
urls = ["http://my-kube-apiserver:8080/metrics"]
```
You can use more complex configuration
to filter and some tags
```toml
# Get all metrics from Kube-apiserver
[[inputs.prometheus]]
# An array of urls to scrape metrics from.
urls = ["http://my-kube-apiserver:8080/metrics"]
# Get only metrics with "apiserver_" string is in metric name
namepass = ["apiserver_*"]
# Add a metric name prefix
name_prefix = "k8s_"
# Add tags to be able to make beautiful dashboards
[inputs.prometheus.tags]
kubeservice = "kube-apiserver"
```
### Measurements & Fields & Tags:
Measurements and fields could be any thing.
It just depends of what you're quering.
Example:
```
# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 0.00010425500000000001
go_gc_duration_seconds{quantile="0.25"} 0.000139108
go_gc_duration_seconds{quantile="0.5"} 0.00015749400000000002
go_gc_duration_seconds{quantile="0.75"} 0.000331463
go_gc_duration_seconds{quantile="1"} 0.000667154
go_gc_duration_seconds_sum 0.0018183950000000002
go_gc_duration_seconds_count 7
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 15
```
- go_goroutines,
- gauge (integer, unit)
- go_gc_duration_seconds
- field3 (integer, bytes)
- All measurements have the following tags:
- url=http://my-kube-apiserver:8080/metrics
- go_goroutines has the following tags:
- kubeservice=kube-apiserver
- go_gc_duration_seconds has the following tags:
- kubeservice=kube-apiserver
### Example Output:
Example of output with configuration given above:
```
$ ./telegraf -config telegraf.conf -test
k8s_go_goroutines,kubeservice=kube-apiserver,url=http://my-kube-apiserver:8080/metrics gauge=536 1456857329391929813
k8s_go_gc_duration_seconds,kubeservice=kube-apiserver,url=http://my-kube-apiserver:8080/metrics 0=0.038002142,0.25=0.041732467,0.5=0.04336492,0.75=0.047271799,1=0.058295811,count=0,sum=208.334617406 1456857329391929813
```