# Metric Monitoring

### Popular Option: Prometheus

<figure><img src="/files/AQowwYSEhvCdDnDHVFiQ" alt=""><figcaption></figcaption></figure>

### 4 Key components:

* The TSDB (time series database) actually stores the billions of individual measurements of things like page load time
* The "retrieval" section takes data from various places, like parsing them from log messages or measuring how long individual jobs took, and puts them in the database
* The alert manager sends notifications to the relevant people when INCIDENT
* The web UI is primary used to understand the metrics alerted someone has been alerted of a fault


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# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.