How to collect Juju metrics
See also:
This documents shows how to collect metrics about Juju itself using Prometheus.
It is possible for charmed operators to collect metrics about other charmed operators (see Metric collecting charmed operators ).
Contents:
Connect Juju to Prometheus
Each controller provides an HTTPS endpoint to expose Prometheus metrics. To feed these metrics into Prometheus, you must add a new scrape target to your already installed and running Prometheus instance. For this use case, the only constraint on where Prometheus is running is that the server must be able to contact the controller’s API address/port.
Add authorisation information
The Juju controller’s metrics endpoint requires authorisation, so create a user and password for Prometheus to use:
juju add-user prometheus
juju change-user-password prometheus
When prompted, enter the password twice:
new password: <password>
type new password again: <password>
For the prometheus user to be able to access the metrics endpoint, grant the user read access to the controller model:
juju grant prometheus read controller
Skip validation
Juju serves the metrics over HTTPS, with no option of degrading to HTTP. You can configure your Prometheus instance to skip validation, or enter this to store the controller’s CA certificate in a file for Prometheus to verify the server’s certificate against:
juju controller-config ca-cert > /path/to/juju-ca.crt
Add a scrape target
To add a scrape target to Prometheus, add the following to prometheus.yaml:
scrape_configs:
job_name: juju
metrics_path: /introspection/metrics
scheme: https
static_configs:
targets: ['<controller-address>:17070']
basic_auth:
username: user-prometheus
password: <password>
tls_config:
ca_file: /path/to/juju-ca.crt
The username syntax in the scrape_configs is important and should contain the user- portion.
Last updated 1 year, 5 months ago.