Collapse a log into error signatures with counts and first/last occurrence

Overview

Groups the records of a log or CI output by signature: timestamps, UUIDs, IPs, hex ids, quoted values and numbers are replaced by placeholders, stack-trace continuation lines are attached to their record and contribute their first frames, and each signature reports its count, severity, first and last line, first and last timestamp (as written, when the line starts with an ISO 8601 timestamp) and an example. Lets an agent read 5,000 lines as 20 signatures. Does not diagnose ca

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