Windows doc (#530)

* Add windows configuration documentation

* Flush out comments and fix misspelled name

* Fix space

* Fix minor spacing/spelling issues

* Inline configuration

docs/configuration-reference.md

@@ -2143,6 +2143,9 @@ statsd_exporter: <statsd_exporter_config>
 # Controls the consul_exporter integration
 consul_exporter: <consul_exporter_config>
 
+# Controls the windows_exporter integration
+windows_exporter: <windows_exporter_config>
+
 # Automatically collect metrics from enabled integrations. If disabled,
 # integrations will be run but not scraped and thus not remote_written. Metrics
 # for integrations will be exposed at /integrations/<integration_key>/metrics
@@ -3474,3 +3477,146 @@ Full reference of options:
   # Forces the read to be fully consistent.
   [require_consistent: <bool> | default = false]
 ```
+
+
+### windows_exporter_config
+
+The `windows_exporter_config` block configures the `windows_exporter`
+integration, which is an embedded version of
+[`windows_exporter`](https://github.com/grafana/windows_exporter). This allows
+for the collection of Windows metrics and exposing them as Prometheus metrics.
+
+Full reference of options:
+
+```yaml
+  # Enables the windows_exporter integration, allowing the Agent to automatically
+  # collect system metrics from the local windows instance 
+  [enabled: <boolean> | default = false]
+
+  # Automatically collect metrics from this integration. If disabled,
+  # the consul_exporter integration will be run but not scraped and thus not
+  # remote-written. Metrics for the integration will be exposed at
+  # /integrations/windows_exporter/metrics and can be scraped by an external
+  # process.
+  [scrape_integration: <boolean> | default = <integrations_config.scrape_integrations>]
+
+  # How often should the metrics be collected? Defaults to
+  # prometheus.global.scrape_interval.
+  [scrape_interval: <duration> | default = <global_config.scrape_interval>]
+
+  # The timeout before considering the scrape a failure. Defaults to
+  # prometheus.global.scrape_timeout.
+  [scrape_timeout: <duration> | default = <global_config.scrape_timeout>]
+
+  # Allows for relabeling labels on the target.
+  relabel_configs:
+    [- <relabel_config> ... ]
+
+  # Relabel metrics coming from the integration, allowing to drop series
+  # from the integration that you don't care about.
+  metric_relabel_configs:
+    [ - <relabel_config> ... ]
+
+  # How frequent to truncate the WAL for this integration.
+  [wal_truncate_frequency: <duration> | default = "60m"]
+
+  # Monitor the exporter itself and include those metrics in the results.
+  [include_exporter_metrics: <bool> | default = false]
+
+  #
+  # Exporter-specific configuration options
+  #
+
+  # List of collectors to enable
+  [enabled_collectors: <string> | default = "cpu,cs,logical_disk,net,os,service,system,textfile"]
+
+  # The following settings are only used if they are enabled by specifying them in enabled_collectors
+  
+  # Configuration for Exchange Mail Server
+  exchange:
+    # Comma-separated List of collectors to use. Defaults to all, if not specified.
+    # Maps to collectors.exchange.enabled in windows_exporter
+    [enabled_list: <string>]
+  
+  # Configuration for the IIS web server
+  iis:
+    # Regexp of sites to whitelist. Site name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.iis.site-whitelist in windows_exporter
+    [site_whitelist: <string> | default = ".+"]
+  
+    # Regexp of sites to blacklist. Site name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.iis.site-blacklist in windows_exporter
+    [site_blacklist: <string> | default = ""]
+  
+    # Regexp of apps to whitelist. App name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.iis.app-whitelist in windows_exporter
+    [app_whitelist: <string> | default=".+"]
+  
+    # Regexp of apps to blacklist. App name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.iis.app-blacklist in windows_exporter
+    [app_blacklist: <string> | default=".+"]
+  
+  # Configuration for reading metrics from a text files in a directory
+  text_file:
+    # Directory to read text files with metrics from.
+    # Maps to collector.textfile.directory in windows_exporter
+    [text_file_directory: <string> | default="C:\Program Files\windows_exporter\textfile_inputs"]
+  
+  # Configuration for SMTP metrics
+  smtp:
+    # Regexp of virtual servers to whitelist. Server name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.smtp.server-whitelist in windows_exporter
+    [whitelist: <string> | default=".+"]
+  
+    # Regexp of virtual servers to blacklist. Server name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.smtp.server-blacklist in windows_exporter
+    [blacklist: <string> | default=""]
+  
+  # Configuration for Windows Services
+  service:
+    # "WQL 'where' clause to use in WMI metrics query. Limits the response to the services you specify and reduces the size of the response.
+    # Maps to collector.service.services-where in windows_exporter
+    [where_clause: <string> | default=""]
+  
+  # Configuration for Windows Processes
+  process:
+    # Regexp of processes to include. Process name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.process.whitelist in windows_exporter
+    [whitelist: <string> | default=".+"]
+  
+    # Regexp of processes to exclude. Process name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.process.blacklist in windows_exporter
+    [blacklist: <string> | default=""]
+  
+  # Configuration for NICs
+  network:
+    # Regexp of NIC's to whitelist. NIC name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.net.nic-whitelist in windows_exporter
+    [whitelist: <string> | default=".+"]
+  
+    # Regexp of NIC's to blacklist. NIC name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.net.nic-blacklist in windows_exporter
+    [blacklist: <string> | default=""]
+  
+  # Configuration for Microsoft SQL Server
+  mssql:
+    # Comma-separated list of mssql WMI classes to use.
+    # Maps to collectors.mssql.classes-enabled in windows_exporter
+    [enabled_classes: <string> | default="accessmethods,availreplica,bufman,databases,dbreplica,genstats,locks,memmgr,sqlstats,sqlerrors,transactions"]
+  
+  # Configuration for Microsoft Queue
+  msqm:
+    # WQL 'where' clause to use in WMI metrics query. Limits the response to the msmqs you specify and reduces the size of the response.
+    # Maps to collector.msmq.msmq-where in windows_exporter
+    [where_clause: <string> | default=""]
+  
+  # Configuration for disk information
+  logical_disk:
+    # Regexp of volumes to whitelist. Volume name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.logical_disk.volume-whitelist in windows_exporter
+    [whitelist: <string> | default=".+"]
+  
+    # Regexp of volumes to blacklist. Volume name must both match whitelist and not match blacklist to be included.
+    # Maps to collector.logical_disk.volume-blacklist in windows_exporter
+    [blacklist: <string> | default=".+"]
+```