fix(detect_exceptions): replace catch-all rule with targeted patterns for JavaException

[vparfonov]

Summary

Fix incorrect multiline exception detection that merges independent JSON log records (LOG-9963) while maintaining support for legitimate multi-line exceptions including Java exceptions with non-indented continuation lines like Oracle ORA errors (LOG-9995).

Problem

The detect_exceptions transform was using a bounded catch-all regex pattern ^.+$ to match continuation lines of Java exceptions. While bounded (max 2 lines), this pattern was still too greedy and would match ANY non-empty line after an exception keyword, causing independent log records to be incorrectly merged into a single event.

Example of the bug:

java.lang.RuntimeException: something went wrong    ← matches exception keyword
first continuation line without stack trace         ← matches ^.+$, merged
second continuation line without stack trace        ← matches ^.+$, merged
third unrelated message                             ← stops here (limit reached)

Result: 3 independent messages merged into 1 event

Solution

Replace the generic catch-all with 3 targeted continuation patterns that:

1. Handle legitimate multi-line scenarios (ORA errors, error codes, parenthetical continuations)
2. Prevent merger of arbitrary text/JSON messages

New patterns:

• ^[A-Z]+-?\d+ — Oracle ORA errors, DB error codes (e.g., ORA-12521)
• ^[\t ]*\( — Parenthetical continuations (e.g., CONNECTION_ID)
• ^[\t ]+\S— Indented lines (standard stack frames)

These fire from both JavaAfterException and JavaContinuation states, allowing proper chaining through the state machine while being selective about what gets merged.

Fixes

• LOG-9963: Independent log records with exception keywords no longer incorrectly merged (and LOG-9998)
• Maintains LOG-9995 support: ORA errors and other error codes properly grouped via targeted patterns instead of catch-all

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[vparfonov]

/assign @jcantrill
/cc @Clee2691

[vparfonov]

/retest-required

[jcantrill]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jcantrill, vparfonov

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