Logstash grok ignore field if unavailable

I'm trying to skip field if any of below field is missing I couldn't to parse

Grok expression for above


Lets Say If VD is missing It has to parse by skipping field, I looking for universal pattern that parses even if any field is missing .

Any idea would be helpful thank you

What would the line look like if a field were missing? You can make a field optional by surrounding it with ()?

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