feat(config): added config option to enable/disable autodiscovery

[paologallinaharbur]

Use Case
Sometimes we want to run the integration in an environment where autodiscovery is not needed or due to permission limitation cannot be performed. In this scenarios hundreds of error logs were shown together with failing request to k8s APIs.

Es: service account running the pod ha not visibility into the whole cluster.

time="2020-08-28T11:20:53Z" level=warning msg="couldn't list node resource, retrying" component=KubernetesAPI error="timeout reached, 60 retries executed. last error: nodes is forbidden: User \"system:serviceaccount:new-relic:nri-prometheus\" cannot list resource \"nodes\" in API group \"\" at the cluster scope"

Solution

• A config option enable_autodiscovery has been added in order to add the possibility to enable/disable autodiscovery.
• By default such config is set to true

UPDATE

After discussion the config option as been called disable_autodiscovery with default false