---
title: "Enter the Prometheus data source URL | Grafana Labs"
description: "Learn how to add the Prometheus server endpoint URL"
---

# Enter the Prometheus data source URL

In this milestone, you enter the Prometheus server URL. This URL is the address of the machine where Prometheus collects data. Watch video ->

1. In the **Prometheus server URL** field, enter your Prometheus server address.
   
   For example: `http://localhost:9090`
   
   Private data source connect (PDC) enables connection requests to resolve to this private address.

> **Did you know?** If you aren’t using PDC, you must enter a public IP or a fully qualified domain name for the address to resolve over the public network.

We recommend establishing a PDC connection. Without this secure connection, any queries and data exchanged between your on-premise data sources and Grafana Cloud occur over an insecure channel.

In the next milestone, you’ll configure basic security.

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### More to explore (optional)

- [Create a private connection to a data source](/docs/learning-paths/private-data-source-connect/)