Prometheus

What are the types of matches?

• equality

• negative equality

• RE

• NRE

Selector that returns many samples for each time series for may time samples is known as ______

• instant vector selector

• range vector selector

• scalar

• string

what is the default retention period of metrices in prometheus

• 25 days

• 30 days

• 1 year

• 15 days

Prometheus exposes metrices over

• http

• https

• smtp

• ftp

Components in Prometheus architecture

• Push gateway

• alert manager

• exporters

• Service discovery

• Grafana

What is service discovery?

What are the different PromQL data types available in Prometheus Expression language?

• Instant Vector

• Range Vector

• Scalar

• String

How To calculate the average request duration over the last 5 minutes from a histogram or summary?

histogram or summary called http_request_duration_seconds

• rate(http_request_duration_seconds_sum[5m]) / rate(http_request_duration_seconds_count[5m])

• rate(http_request_duration_seconds[5m]) / rate(http_request_duration_seconds_count[5m])

• rate(http_request_duration_seconds_sum[5m]) / rate(http_request_duration_seconds[5m])

• none

How do I check my Prometheus status?

• Open your browser and go to http://localhost:9090

• Run check-node_exporter

• curl the endpoint

• do ssh

How do you increase the time retention period in Prometheus?

• Open the /etc/sysconfig/prometheus change the time and

  systemctl restart prometheus.service

• Open the /etc/config/prometheus change the time and

  systemctl restart prometheus.service

• Open the /etc/sysconfig/prometheus/retention_period change the time and

  systemctl restart prometheus.service

• Open the /etc/sysconfig/prometheus change the time

  STORAGE_RETENTION="--storage.tsdb.retention.time=30d" and

  systemctl restart prometheus.service