Create a Grafana annotation via the api in PowerShell

create-grafana-annotation.ps1

$grafana = "http://yerhost:3000"

$headers = @{ Accept = "application/json"; Authorization = "Bearer yerApiKey" }

# This is how you get your timezone handled properly.  Also, this lovely .ToUnixTimeMilliseconds() is just the ticket.
# 
$timeEpoch = (new-object DateTimeOffset -ArgumentList $(get-date)).ToUnixTimeMilliseconds()

# Panel id is optional.
# 
$createAnnotationReq = @{ dashboardId = 3; panelId = 4; text = "I can haz annotations via api?"; time = $timeEpoch }

Invoke-RestMethod `
  -Headers $headers `
  -ContentType application/json `
  -method post `
  -uri ("{0}/api/annotations" -f $grafana) `
  -body $(convertto-json $createAnnotationReq -compress)