PCA PCA Service Discovery & Configuration 2

Question 1

What does the `__address__` label represent in Prometheus target discovery?

Accepted Answer

The host:port used to scrape the target

Answer

`__address__` holds the `host:port` that Prometheus uses to construct the scrape URL for a target.

Question 2

Which Prometheus SD config discovers targets by querying DNS SRV records?

Accepted Answer

dns_sd_config

Answer

`dns_sd_config` resolves DNS A, AAAA, or SRV records on a configurable refresh interval to discover scrape targets.

Question 3

What Prometheus relabeling action copies a source label value into a new label name?

Accepted Answer

replace

Answer

The `replace` action (the default) copies a matched source label value (optionally transformed by regex) into a target label.

Question 4

Which relabeling action renames all labels matching a regex by applying a replacement pattern to their names?

Accepted Answer

labelmap

Answer

`labelmap` applies the regex to all label *names* and renames matching labels according to the replacement pattern, useful for promoting meta-labels.

Question 5

What is the role of the `__metrics_path__` label in Prometheus scrape targets?

Accepted Answer

Specifies the HTTP path Prometheus requests to collect metrics

Answer

`__metrics_path__` overrides the default `/metrics` HTTP path for a specific target, allowing non-standard exposition endpoints.

(PCA) Prometheus Certified Associate Practice Test