GRAYLOG - Chapter 4, Exercise 3 Solution
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Writing a requestId Lookup Query

PROBLEM
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Write a query, using this chapter's own real syntax, that finds every
log line associated with the request ID 7f2a-91bc.

SOLUTION
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This chapter's own real worked example used the pattern
requestId:"<id from a candidate message>", with the ID value wrapped in
double quotes. Substituting the given ID:

    requestId:"7f2a-91bc"

The value is quoted here because it contains a hyphen - a sensible,
safe habit (matching the same reasoning already used for daxtraResource
values in Chapter 2) to ensure the whole ID is treated as one exact
value rather than being split apart.

ANSWER: requestId:"7f2a-91bc"

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WHY THIS WORKS AS AN ANSWER

This directly reuses this chapter's own real worked query pattern,
substituting the given ID value in place of the placeholder. Quoting
the ID is the same defensive habit already established for
daxtraResource in Chapter 2 - any ID or field value containing
punctuation like a hyphen is safer quoted than left bare.