Collecting Runtime Configurations

[davidkopp]

Besides package manager dependencies and artifacts also runtime configurations may be relevant for the energy consumption of a system.

This issue is a epic for this topic. Other issues will be used to describe the collection of a specific runtime configuration type.

Brainstorming of potential relevant configurations:

• Environment Variables
  • Memory/CPU limits - JAVA_OPTS, NODE_OPTIONS, GOMAXPROCS
  • Logging levels - LOG_LEVEL, DEBUG, PYTHONOPTIMIZE
  • Feature flags - ENABLE_CACHING, FEATURE_XYZ_ENABLED
  • Connection pools - DB_POOL_SIZE, MAX_CONNECTIONS
  • Worker processes - WEB_CONCURRENCY, WORKERS
  • APM settings - DATADOG_TRACE_SAMPLE_RATE, NEWRELIC_ENABLED
• Runtime-relevant Settings from Configuration Files (Parsing Required)
  • Application configs - application.yml, config.json, settings.py
  • Runtime configs - jvm.options, gunicorn.conf.py
  • Web server configs - nginx.conf, apache2.conf
  • Database configs - postgresql.conf, my.cnf
  • Init system configs - systemd unit files, supervisord configs
  • Process management - Docker entrypoint scripts, startup scripts
  • System network configs - /etc/hosts, /etc/resolv.conf, /etc/nsswitch.conf
  • System resource configs - /etc/security/limits.conf, /etc/systemd/system.conf
  • Kernel tuning configs - /etc/sysctl.conf, /etc/sysctl.d/*
  • CPU/scheduling configs - /etc/default/grub, /sys/devices/system/cpu/ settings
  • Memory management configs - /proc/sys/vm/ tunables, swap configurations
  • I/O scheduler configs - /sys/block/*/queue/scheduler, I/O priority settings
  • Network stack configs - /etc/systemd/networkd.conf, TCP buffer settings
  • Logging system configs - /etc/rsyslog.conf, /etc/journald.conf
  • Time/locale configs - /etc/timezone, /etc/locale.conf (affects string operations)
• Container Runtime Inspection
  • Resource limits - Memory limits, CPU quotas from container runtime
  • Security contexts - User namespaces, capabilities
  • Volume mounts - Tmpfs usage, bind mounts
• Process/System Inspection (Runtime state)
  • Command line arguments - /proc/PID/cmdline
  • System limits - /proc/PID/limits
  • Active connections - netstat, /proc/net/
  • Thread counts - /proc/PID/task/
• Application Sideloading Patterns (Static Code Analysis)
  • HTTP config clients - requests.get(), fetch(), HttpClient calls for runtime config
  • Remote config frameworks - Spring Cloud Config, Consul Template, etcd client usage
  • Dynamic library loading - dlopen(), LoadLibrary(), Python importlib for runtime libs
  • Plugin/extension loading - Runtime loading from /plugins/, /extensions/ directories
  • Package sideloading - Code downloading JARs, Python packages, Node modules at runtime
  • Feature flag clients - LaunchDarkly, Split.io, Flagsmith SDK usage
  • Service discovery clients - Consul, etcd, Kubernetes API calls for endpoint discovery