v0.4.0

Added

System (Linux)

• Cgroup v2 resource limit collectors (cpu.max, memory.max, memory.current, pids, cpuset, io.max, etc.)
• Cgroup v1 resource limit collectors (cpu.shares, cpu.cfs_quota, memory.limit, etc.)
• Container identity collectors (cgroup membership, mountinfo, environment, K8s namespace)
• Cloud/hardware identity collectors (DMI bios_vendor, product_name, sys_vendor, chassis_asset_tag)
• Auto-detection of container runtime (Docker, Kubernetes, containerd, LXC)

Authentication

• SSL/TLS with configurable -sslmode (prefer, disable, require, verify-ca, verify-full)
• Certificate authentication (-sslcert, -sslkey, -sslrootcert)
• GSSAPI/Kerberos authentication
• PGSSLMODE, PGSSLCERT, PGSSLKEY, PGSSLROOTCERT environment variables

Changed

• PostgreSQL driver switched from lib/pq to pgx
• Default sslmode changed from disable to prefer
• Go bumped from 1.23 to 1.24.13
• Collector errors now distinguish skip (unavailable) from real failures

Fixed

• db handle leak on ping failure
• Summary printed before zero-data check
• PGDATABASE fallback ordering with --skip-system
• Connection string quoting for values with spaces