PromEx.GrafanaClient.create_annotation

You're seeing just the function create_annotation, go back to PromEx.GrafanaClient module for more information.
Link to this function

create_annotation(grafana_conn, tags, message)

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Specs

create_annotation(
  grafana_conn :: PromEx.GrafanaClient.Connection.t(),
  tags :: [String.t()],
  message :: String.t()
) :: handler_response()

Used to create annotations on dashboard panels