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# Collecting metrics
Netdata can collect metrics from hundreds of different sources, be they internal data created by the system itself, or
external data created by services or applications. To see _all_ of the sources Netdata collects from, view our
[list of supported collectors](https://github.com/netdata/netdata/blob/master/collectors/COLLECTORS.md).
There are two essential points to understand about how collecting metrics works in Netdata:
- All collectors are **installed by default** with every installation of Netdata. You do not need to install
collectors manually to collect metrics from new sources.
- Upon startup, Netdata will **auto-detect** any application or service that has a
[collector](https://github.com/netdata/netdata/blob/master/collectors/COLLECTORS.md), as long as both the collector
and the app/service are configured correctly.
Most users will want to enable a new Netdata collector for their app/service. For those details, see
our [collectors' configuration reference](https://github.com/netdata/netdata/blob/master/collectors/REFERENCE.md).
## Take your next steps with collectors
[Supported collectors list](https://github.com/netdata/netdata/blob/master/collectors/COLLECTORS.md)
[Collectors configuration reference](https://github.com/netdata/netdata/blob/master/collectors/REFERENCE.md)
## Guides
[Monitor Nginx or Apache web server log files with Netdata](https://github.com/netdata/netdata/blob/master/docs/guides/collect-apache-nginx-web-logs.md)
[Monitor CockroachDB metrics with Netdata](https://github.com/netdata/netdata/blob/master/docs/guides/monitor-cockroachdb.md)
[Monitor Unbound DNS servers with Netdata](https://github.com/netdata/netdata/blob/master/docs/guides/collect-unbound-metrics.md)
[Monitor a Hadoop cluster with Netdata](https://github.com/netdata/netdata/blob/master/docs/guides/monitor-hadoop-cluster.md)
## Related features
**[Dashboards](https://github.com/netdata/netdata/blob/master/web/README.md)**: Visualize your newly-collect metrics in
real-time using Netdata's [built-in dashboard](https://github.com/netdata/netdata/blob/master/web/gui/README.md).
**[Exporting](https://github.com/netdata/netdata/blob/master/exporting/README.md)**: Extend our
built-in [database engine](https://github.com/netdata/netdata/blob/master/database/engine/README.md), which supports
long-term metrics storage, by archiving metrics to external databases like Graphite, Prometheus, MongoDB, TimescaleDB,
and more. It can export metrics to multiple databases simultaneously.
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