Logstash help with pattern for grok needed

Hello, I am trying to parse some data which is in one of the two following formats:

Sample data:

Data from service service-a loaded
Data from service service-b not loaded

With the following Grok Pattern:

Data from service %{NOTSPACE:service} %{NOT:n}loaded

and custom patterns:

NOT (?:not )

I work in Kibana > Grok Debugger. It seems that my pattern matches the second line of sample data but not the first. I am trying to make it so that the "not " part is optional, and to generate a pattern which matches all my inputs. Could you help me?

Second question, is it possible to use grok to output an integer value, 0 or 1, depending on whether the data from the service is loaded or not?

That is, I believe, a non-capturing field. If you want an optional field then the ? should be at the end

(not )?
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Thank you, that works. Would someone have an idea for the second question as well?

The field [n] will only exist if the service is not loaded, so you could use

if [n] {
    mutate { add_field => { "someField" => 0 } }
} else {
    mutate { add_field => { "someField" => 1 } }
mutate { convert => { "someField" => "integer" } }
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