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docs/sd_configs.md: document file_sd_configs

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* `dockerswarm_sd_configs` is for discovering and scraping [Docker Swarm](https://docs.docker.com/engine/swarm/) targets. See [these docs](#dockerswarm_sd_configs).
* `ec2_sd_configs` is for discovering and scraping [Amazon EC2](https://aws.amazon.com/ec2/) targets. See [these docs](#ec2_sd_configs).
* `eureka_sd_configs` is for discovering and scraping targets registered in [Netflix Eureka](https://github.com/Netflix/eureka). See [these docs](#eureka_sd_configs).
* `file_sd_configs` is for scraping targets defined in external files (aka file-based service discovery). See [these docs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config).
* `file_sd_configs` is for scraping targets defined in external files (aka file-based service discovery). See [these docs](#file_sd_configs).
* `gce_sd_configs` is for discovering and scraping Google Compute Engine (GCE) targets. See [gce_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#gce_sd_config). `vmagent` provides the following additional functionality for `gce_sd_config`:
* if `project` arg is missing then `vmagent` uses the project for the instance where it runs;
* if `zone` arg is missing then `vmagent` uses the zone for the instance where it runs;
@ -509,6 +509,43 @@ scrape_configs:
# See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```
## file_sd_configs
File-based service discovery reads a set of files containing a list of targets to scrape.
Scrape targets are automatically updated when the underlying files are changed.
Files may be provided in YAML or JSON format. Files must contain a list of static configs in the following format:
* JSON:
```json
[
{
"targets": ["<host>", ... ],
"labels": {
"<labelname>": "<labelvalue>",
...,
}
},
...
]
```
* YAML:
```yaml
- targets: ["<host>", ... ]
labels:
<labelname>: <labelvalue>
...
...
```
Each target has a meta label `__meta_filepath` during the [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling) phase.
Its value is set to the filepath from which the target was extracted.
See the [list of integrations](https://prometheus.io/docs/operating/integrations/#file-service-discovery) with `file_sd_configs`.
## yandexcloud_sd_configs
[Yandex Cloud](https://cloud.yandex.com/en/) SD configurations allow retrieving scrape targets from accessible folders.