Add multi-line detection support to promtail #399
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Relevant issue: #74
Largely inspired by the code in the fluentd concat plugin: https://github.com/fluent-plugins-nursery/fluent-plugin-concat
Adds a buffer in front of the HTTP client that checks whether a line matches a regex. Lines that do not are merged with a newline with buffered lines. When a new log line matches the regex, the previous lines are flushed, and the new line is buffered. A task that runs every second checks buffered lines and force-flushes them if they're older than a configured timeout.
Regex and timeout are configurable per-scraper-config. By default, the concat functionality is disabled to preserve existing behavior.
TODOs: