v2.1.0

Changed

• Migrate to new plugin API (cmk.agent_based.v2, cmk.rulesets.v1, cmk.graphing.v1) — compatible with Checkmk 2.3+
• Replace Docker-based packaging with package.py script

Added

• Graphing definitions for all metrics
• Unit tests
• CI workflow

Fixed

• accepted_conn_per_sec levels now correctly applied (key mismatch with ruleset fixed)
• version.min_required set to 2.3.0p1