Update external.html.md

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Very few infrastructures are entirely self-contained. Most rely on a multitude
of external service providers. Consul supports this by allowing for the definition
of external services, services that are not provided by a local node.
of external services, services that are not provided by a local node. There's also a
companion project called [Consul ESM](https://github.com/hashicorp/consul-esm) which
is a daemon that functions as an external service monitor that can help run health
checks for external services.
Most services are registered in Consul through the use of a
[service definition](/docs/agent/services.html). However, this approach registers