PCA Service Discovery & Configuration Flashcards

Which Prometheus configuration block allows per-target scrape parameter overrides such as custom query params?

Answer: params

The `params` map in a scrape_config appends arbitrary HTTP query parameters to every scrape request, commonly used with multi-target exporters.

What Prometheus label controls which Alertmanager instance a particular alert is routed to?

Answer: There is no per-alert routing to specific Alertmanagers

Prometheus sends all alerts to all configured Alertmanager instances; per-alert Alertmanager selection is not a Prometheus feature — routing is handled inside Alertmanager.

What is the effect of setting `honor_labels: true` in a Prometheus scrape_config?

Answer: Prometheus preserves conflicting labels from the scraped metrics over its own labels

With `honor_labels: true`, when a scraped metric carries a label that conflicts with a Prometheus-attached label, the scraped value wins and the Prometheus label is renamed.

Which Prometheus CLI flag triggers a hot reload of the configuration file without restarting the process?

Answer: Sending SIGHUP to the Prometheus process

Sending `SIGHUP` to the Prometheus process causes it to re-read `prometheus.yml` and apply changes without downtime.

What does the `target_label` field specify in a Prometheus relabel_config rule?

Answer: The name of the label that will be written with the replacement value

`target_label` names the destination label that receives the result of the regex replacement in a relabeling rule.

In a Prometheus scrape_config, what does `scheme: https` combined with an empty `tls_config` result in by default?

Answer: TLS is used but the target certificate is verified against system CAs

Without explicit `ca_file` or `insecure_skip_verify`, Prometheus validates the target's certificate against the host system's default CA bundle.