PCA PCA Storage & Retention 2

Question 1

Which Prometheus feature enables long-term metric storage by sending data to an external system?

Accepted Answer

remote_write

Answer

federation

Answer

file_sd_configs

Answer

recording_rules

Question 2

What does Prometheus TSDB compaction do?

Accepted Answer

Merges and deduplicated smaller blocks into larger, more efficient blocks

Answer

Converts text exposition format to binary

Answer

Compresses WAL files to reduce RAM usage

Answer

Aggregates metrics across multiple Prometheus instances

Question 3

What is a Prometheus 'block' on disk?

Accepted Answer

An immutable directory containing chunks, an index, and metadata for a fixed time range

Answer

A single scrape result file per target

Answer

A WAL segment written every 15 seconds

Answer

A JSON export of all active time series

Question 4

Which flag controls how long Prometheus retains data when using time-based retention?

Accepted Answer

--storage.tsdb.retention.time

Answer

--storage.tsdb.max-age

Answer

--tsdb.retention-days

Answer

--storage.local.retention

Question 5

What is Prometheus federation primarily used for in storage contexts?

Accepted Answer

Allowing one Prometheus server to scrape metrics from another Prometheus server

Answer

Replicating data across multiple TSDB nodes

Answer

Synchronizing WAL files between HA pairs

Answer

Backing up blocks to object storage

Question 6

What does the `remote_read` configuration in Prometheus enable?

Accepted Answer

Querying historical data from a remote storage backend when local data is unavailable

Answer

Reading scrape targets from a remote file server

Answer

Fetching recording rules from a remote API

Answer

Importing Grafana dashboards remotely