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agent/LOGGING_PACKAGES.md

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+# Logging Package Options
+
+This agent already uses a library approach for journald (`github.com/coreos/go-systemd/v22/sdjournal`) and does not shell out to `journalctl` in normal collection paths.
+
+## Current (keep)
+
+- `github.com/coreos/go-systemd/v22/sdjournal`
+  - Direct journal access from Go.
+  - Cursor-based reads map well to incremental shipping.
+- `github.com/coreos/go-systemd/v22/dbus` (candidate add-on)
+  - Read systemd unit state/metadata (`ListUnitsByNames`, unit properties) for richer service context.
+
+## Good external collectors (if we want hardened third-party gathering)
+
+- Fluent Bit
+  - `systemd` input plugin for journald, plus mature filtering/parsing/routing outputs.
+  - Strong choice when we want a small footprint daemon dedicated to log forwarding.
+- Vector
+  - `journald` source + transforms (VRL) for compact line formatting before shipping.
+  - Good if we want expressive local transforms and multiple downstream sinks.
+- OpenTelemetry Collector distributions with journald receiver support (for example Splunk OTel distro)
+  - Useful if we want logs + metrics + traces through one pipeline.
+
+## Parser packages (when we need deeper line parsing)
+
+- `github.com/influxdata/go-syslog/v3`
+  - RFC3164/RFC5424 syslog parsing for file or stream logs.
+- `github.com/elastic/go-grok`
+  - Pattern-based parsing when message formats vary by service.
+
+## Practical direction
+
+1. Keep `go-systemd` for now and add optional `dbus` lookups for service status enrichment.
+2. If we need host-agnostic, independently hardened collection, run Fluent Bit or Vector and ingest normalized JSON lines in the agent/server.
+3. Reserve heavier parsing packages (`go-syslog`, `go-grok`) for specific source formats that require structured extraction beyond current compact line ingestion.