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Published: Apr 7, 2020 License: GPL-3.0 Imports: 14 Imported by: 0


How to monitor with prometheus


Start scrapping services

To start scrapping with prometheus you must create or edit the prometheus config file and add all the services you want to scrap, like these:

  scrape_interval:     15s # By default, scrape targets every 15 seconds.

  # Attach these labels to any time series or alerts when communicating with
  # external systems (federation, remote storage, Alertmanager).
    monitor: 'codelab-monitor'

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'

    # Override the global default and scrape targets from this job every 5 seconds.
    scrape_interval: 5s

      - targets: ['localhost:9090']
+  - job_name: 'beacon-chain'
+    static_configs:
+      - targets: ['localhost:8080']

After creating/updating the prometheus file run it:

$ prometheus --config.file=your-prometheus-file.yml

Now, you can add the prometheus server as a data source on grafana and start building your dashboards.

How to add additional metrics

The prometheus service export the metrics from the DefaultRegisterer so just need to register your metrics with the prometheus or promauto libraries. To know more Go application guide




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func RunSimpleServerOrDie

func RunSimpleServerOrDie(addr string)

RunSimpleServerOrDie is a blocking call to serve /metrics at the given address.


type Handler

type Handler struct {
	Path    string
	Handler func(http.ResponseWriter, *http.Request)

Handler represents a path and handler func to serve on the same port as /metrics, /healthz, /goroutinez, etc.

type LogrusCollector

type LogrusCollector struct {
	// contains filtered or unexported fields

LogrusCollector is a logrus hook to collect log counters.

func NewLogrusCollector

func NewLogrusCollector() *LogrusCollector

NewLogrusCollector register internal metrics and return an logrus hook to collect log counters This function can be called only once, if more than one call is made an error will be returned.

func (*LogrusCollector) Fire

func (hook *LogrusCollector) Fire(entry *logrus.Entry) error

Fire is called on every log call.

func (*LogrusCollector) Levels

func (hook *LogrusCollector) Levels() []logrus.Level

Levels return a slice of levels supported by this hook;

type Service

type Service struct {
	// contains filtered or unexported fields

Service provides Prometheus metrics via the /metrics route. This route will show all the metrics registered with the Prometheus DefaultRegisterer.

func NewPrometheusService

func NewPrometheusService(addr string, svcRegistry *shared.ServiceRegistry, additionalHandlers ...Handler) *Service

NewPrometheusService sets up a new instance for a given address host:port. An empty host will match with any IP so an address like ":2121" is perfectly acceptable.

func (*Service) Start

func (s *Service) Start()

Start the prometheus service.

func (*Service) Status

func (s *Service) Status() error

Status checks for any service failure conditions.

func (*Service) Stop

func (s *Service) Stop() error

Stop the service gracefully.

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