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Added an example for textfile collector 

Added a practical example for textfile collector using a Powershell snippet that generates a valid file.
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Giulio Vian 2019-01-16 13:15:57 +00:00 committed by GitHub
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@ -36,3 +36,21 @@ _This collector does not yet have any useful queries added, we would appreciate
## Alerting examples
_This collector does not yet have alerting examples, we would appreciate your help adding them!_
# Example use
This Powershell script, when run in the `collector.textfile.directory` (default `C:\Program Files\wmi_exporter\textfile_inputs`), generates a valid `.prom` file that should successfully ingested by wmi_exporter.
```Powershell
$alpha = 42
$beta = @{ left=3.1415; right=2.718281828; }
Set-Content -Path test1.prom -Encoding Ascii -NoNewline -Value ""
Add-Content -Path test1.prom -Encoding Ascii -NoNewline -Value "# HELP test_alpha_total Some random metric.`n"
Add-Content -Path test1.prom -Encoding Ascii -NoNewline -Value "# TYPE test_alpha_total counter`n"
Add-Content -Path test1.prom -Encoding Ascii -NoNewline -Value "test_alpha_total ${alpha}`n"
Add-Content -Path test1.prom -Encoding Ascii -NoNewline -Value "# HELP test_beta_bytes Some other metric.`n"
Add-Content -Path test1.prom -Encoding Ascii -NoNewline -Value "# TYPE test_beta_bytes gauge`n"
foreach ($k in $beta.Keys) {
Add-Content -Path test1.prom -Encoding Ascii -NoNewline -Value "test_beta_bytes{spin=""${k}""} $( $beta[$k] )`n"
}
```