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docs/sd_configs.md: document docker_sd_configs

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* `azure_sd_configs` is for scraping the targets registered in [Azure Cloud](https://azure.microsoft.com/en-us/). See [these docs](#azure_sd_configs).
* `consul_sd_configs` is for discovering and scraping targets registered in [Consul](https://www.consul.io/). See [these docs](#consul_sd_configs).
* `digitalocean_sd_configs` is for discovering and scraping targerts registered in [DigitalOcean](https://www.digitalocean.com/). See [these docs](#digitalocean_sd_configs).
* `dns_sd_configs` is for discovering and scraping targets from DNS records (SRV, A and AAAA). See [these docs](#dns_sd_configs).
* `docker_sd_configs` is for discovering and scraping Docker targets. See [docker_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#docker_sd_config).
* `dns_sd_configs` is for discovering and scraping targets from [DNS](https://it.wikipedia.org/wiki/Domain_Name_System) records (SRV, A and AAAA). See [these docs](#dns_sd_configs).
* `docker_sd_configs` is for discovering and scraping Docker targets. See [these docs](#docker_sd_configs).
* `dockerswarm_sd_configs` is for discovering and scraping Docker Swarm targets. See [dockerswarm_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config).
* `ec2_sd_configs` is for discovering and scraping Amazon EC2 targets. See [ec2_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#ec2_sd_config). `vmagent` doesn't support the `profile` config param yet.
* `eureka_sd_configs` is for discovering and scraping targets registered in [Netflix Eureka](https://github.com/Netflix/eureka). See [eureka_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka_sd_config).
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# port: ...
```
## docker_sd_configs
Docker SD configurations allow retrieving scrape targets from [Docker Engine](https://docs.docker.com/engine/) hosts.
Available meta labels:
* `__meta_docker_container_id`: the id of the container
* `__meta_docker_container_name`: the name of the container
* `__meta_docker_container_network_mode`: the network mode of the container
* `__meta_docker_container_label_<labelname>`: each label of the container
* `__meta_docker_network_id`: the ID of the network
* `__meta_docker_network_name`: the name of the network
* `__meta_docker_network_ingress`: whether the network is ingress
* `__meta_docker_network_internal`: whether the network is internal
* `__meta_docker_network_label_<labelname>`: each label of the network
* `__meta_docker_network_scope`: the scope of the network
* `__meta_docker_network_ip`: the IP of the container in this network
* `__meta_docker_port_private`: the port on the container
* `__meta_docker_port_public`: the external port if a port-mapping exists
* `__meta_docker_port_public_ip`: the public IP if a port-mapping exists
Configuration example:
```yaml
scrape_configs:
- job_name: docker
docker_sd_configs:
# host must contain the address of the Docker daemon.
- host: "..."
# port is an optional port to scrape metrics from, when `role` is nodes,
# and for discovered tasks and services that don't have published ports.
# By default port 80 is used.
# port: ...
# host_networking_host is an optional host to use if the container is in host networking mode.
# By default localhost is used.
# host_networking_host: "..."
# filters is an optional filters to limit the discovery process to a subset of available resources.
# See https://docs.docker.com/engine/api/v1.40/#operation/ContainerList
# filters:
# - name: "..."
# values: ["...", "..."]
# Additional HTTP API client options can be specified here.
# See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```
## yandexcloud_sd_configs
[Yandex Cloud](https://cloud.yandex.com/en/) SD configurations allow retrieving scrape targets from accessible folders.