138 lines
5.8 KiB
Markdown
138 lines
5.8 KiB
Markdown
# Prometheus Input Plugin
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The prometheus input plugin gathers metrics from HTTP servers exposing metrics
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in Prometheus format.
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### Configuration:
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```toml
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# Read metrics from one or many prometheus clients
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[[inputs.prometheus]]
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## An array of urls to scrape metrics from.
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urls = ["http://localhost:9100/metrics"]
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## An array of Kubernetes services to scrape metrics from.
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# kubernetes_services = ["http://my-service-dns.my-namespace:9100/metrics"]
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## Kubernetes config file to create client from.
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# kube_config = "/path/to/kubernetes.config"
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## Scrape Kubernetes pods for the following prometheus annotations:
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## - prometheus.io/scrape: Enable scraping for this pod
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## - prometheus.io/scheme: If the metrics endpoint is secured then you will need to
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## set this to `https` & most likely set the tls config.
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## - prometheus.io/path: If the metrics path is not /metrics, define it with this annotation.
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## - prometheus.io/port: If port is not 9102 use this annotation
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# monitor_kubernetes_pods = true
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## Restricts Kubernetes monitoring to a single namespace
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## ex: monitor_kubernetes_pods_namespace = "default"
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# monitor_kubernetes_pods_namespace = ""
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## Use bearer token for authorization. ('bearer_token' takes priority)
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# bearer_token = "/path/to/bearer/token"
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## OR
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# bearer_token_string = "abc_123"
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## Specify timeout duration for slower prometheus clients (default is 3s)
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# response_timeout = "3s"
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## Optional TLS Config
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# tls_ca = /path/to/cafile
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# tls_cert = /path/to/certfile
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# tls_key = /path/to/keyfile
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## Use TLS but skip chain & host verification
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# insecure_skip_verify = false
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```
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`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`
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#### Kubernetes Service Discovery
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URLs listed in the `kubernetes_services` parameter will be expanded
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by looking up all A records assigned to the hostname as described in
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[Kubernetes DNS service discovery](https://kubernetes.io/docs/concepts/services-networking/service/#dns).
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This method can be used to locate all
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[Kubernetes headless services](https://kubernetes.io/docs/concepts/services-networking/service/#headless-services).
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#### Kubernetes scraping
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Enabling this option will allow the plugin to scrape for prometheus annotation on Kubernetes
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pods. Currently, you can run this plugin in your kubernetes cluster, or we use the kubeconfig
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file to determine where to monitor.
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Currently the following annotation are supported:
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* `prometheus.io/scrape` Enable scraping for this pod.
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* `prometheus.io/scheme` If the metrics endpoint is secured then you will need to set this to `https` & most likely set the tls config. (default 'http')
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* `prometheus.io/path` Override the path for the metrics endpoint on the service. (default '/metrics')
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* `prometheus.io/port` Used to override the port. (default 9102)
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Using the `monitor_kubernetes_pods_namespace` option allows you to limit which pods you are scraping.
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#### Bearer Token
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If set, the file specified by the `bearer_token` parameter will be read on
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each interval and its contents will be appended to the Bearer string in the
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Authorization header.
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### Usage for Caddy HTTP server
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If you want to monitor Caddy, you need to use Caddy with its Prometheus plugin:
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* Download Caddy+Prometheus plugin [here](https://caddyserver.com/download/linux/amd64?plugins=http.prometheus)
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* Add the `prometheus` directive in your `CaddyFile`
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* Restart Caddy
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* Configure Telegraf to fetch metrics on it:
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```
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[[inputs.prometheus]]
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# ## An array of urls to scrape metrics from.
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urls = ["http://localhost:9180/metrics"]
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```
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> This is the default URL where Caddy Prometheus plugin will send data.
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> For more details, please read the [Caddy Prometheus documentation](https://github.com/miekg/caddy-prometheus/blob/master/README.md).
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### Metrics:
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Measurement names are based on the Metric Family and tags are created for each
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label. The value is added to a field named based on the metric type.
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All metrics receive the `url` tag indicating the related URL specified in the
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Telegraf configuration. If using Kubernetes service discovery the `address`
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tag is also added indicating the discovered ip address.
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### Example Output:
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**Source**
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```
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# HELP go_gc_duration_seconds A summary of the GC invocation durations.
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# TYPE go_gc_duration_seconds summary
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go_gc_duration_seconds{quantile="0"} 7.4545e-05
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go_gc_duration_seconds{quantile="0.25"} 7.6999e-05
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go_gc_duration_seconds{quantile="0.5"} 0.000277935
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go_gc_duration_seconds{quantile="0.75"} 0.000706591
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go_gc_duration_seconds{quantile="1"} 0.000706591
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go_gc_duration_seconds_sum 0.00113607
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go_gc_duration_seconds_count 4
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# HELP go_goroutines Number of goroutines that currently exist.
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# TYPE go_goroutines gauge
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go_goroutines 15
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# HELP cpu_usage_user Telegraf collected metric
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# TYPE cpu_usage_user gauge
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cpu_usage_user{cpu="cpu0"} 1.4112903225816156
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cpu_usage_user{cpu="cpu1"} 0.702106318955865
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cpu_usage_user{cpu="cpu2"} 2.0161290322588776
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cpu_usage_user{cpu="cpu3"} 1.5045135406226022
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```
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**Output**
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```
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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
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go_goroutines,url=http://example.org:9273/metrics gauge=21 1505776695000000000
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cpu_usage_user,cpu=cpu0,url=http://example.org:9273/metrics gauge=1.513622603430151 1505776751000000000
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cpu_usage_user,cpu=cpu1,url=http://example.org:9273/metrics gauge=5.829145728641773 1505776751000000000
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cpu_usage_user,cpu=cpu2,url=http://example.org:9273/metrics gauge=2.119071644805144 1505776751000000000
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cpu_usage_user,cpu=cpu3,url=http://example.org:9273/metrics gauge=1.5228426395944945 1505776751000000000
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```
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