# Prometheus Endpoint of All Available Metrics

In Prometheus, you can access the endpoint that lists all available metrics by querying the `/metrics` endpoint of your Prometheus server. Here’s how to access this information:

### Accessing the Metrics Endpoint

1. **Default Metrics Endpoint**:
The default endpoint for Prometheus metrics is:
    
    ```
    http://<prometheus-server>:9090/metrics
    ```
    
    Replace `<prometheus-server>` with the hostname or IP address of your Prometheus server. If you're accessing it locally, you can use `localhost`.
    
2. **Accessing via a Web Browser or Curl**:
You can access the metrics endpoint in a web browser by entering the URL:
    
    ```
    <http://localhost:9090/metrics>
    ```
    
    Alternatively, you can use `curl` from the command line:
    
    ```bash
    curl <http://localhost:9090/metrics>
    ```
    
3. **List of Available Metrics**:
Once you access the `/metrics` endpoint, you will see a plain text output containing all the metrics currently being scraped by Prometheus. The metrics will be listed in the following format:
    
    ```
    # HELP <metric_name> <help_text>
    # TYPE <metric_name> <type>
    <metric_name>{<label1>="<value1>",<label2>="<value2>"} <value>
    ```
    
    Each metric is prefixed with `# HELP` and `# TYPE`, which provide additional information about what the metric represents and its data type.
    

### Additional Information

- **Metrics from Exporters**: If you are using exporters (like Node Exporter, Blackbox Exporter, etc.), each exporter will also expose its metrics at its configured endpoint, typically accessible in a similar manner.
- **Filtering Metrics**: If you have many metrics and need to filter them, you can use Prometheus queries in the Prometheus UI (usually accessible at `http://localhost:9090`):
    - Use the **"Graph"** or **"Expression"** tab to write queries. For example, you can type `up` to see the metric for the status of monitored targets.
- **Explore Metrics via Grafana**: If you are using Grafana as a front end for Prometheus, you can also view available metrics by creating a new panel and exploring the metric selection dropdown, which will list available metrics.

### Conclusion

Accessing the Prometheus metrics endpoint is straightforward and provides a comprehensive list of all the metrics being collected. This endpoint is essential for understanding what metrics are available for monitoring and alerting.