What is Grafana used for?

Grafana is used for visualizing and analyzing metrics, logs, and traces from various data sources. It allows creating interactive dashboards for monitoring the performance of systems, applications, and infrastructure.

Main tasks solved with Grafana:

Real-time monitoring: Displaying the current state of the system.
Historical performance analysis: Comparing data over different periods.
Anomaly and problem detection: Visualizing outliers and changes in system behavior.
Reporting: Generating summary data to inform interested parties.
Alerting: Setting up notifications when metrics exceed specified thresholds.

Grafana integrates with many data sources, including Prometheus, Graphite, Elasticsearch, InfluxDB, PostgreSQL, MySQL, and others.

Example of using Grafana for monitoring HTTP metrics from Prometheus:

Configure a Data Source for Prometheus in Grafana.
Create a new dashboard.
Add a Graph panel.
In the query editor, select the Prometheus Data Source and enter a query, for example:
```
// Total number of HTTP requests
sum(http_requests_total)
```
Save the panel and dashboard.

This will allow you to see a graph of the change in the number of HTTP requests.