Introducing Warm Agents, a TeamCity Plugin - The JetBrains Blog

TeamCity’s Warm Agents plugin reduces build queue delays by maintaining a configurable number of idle, pre-started cloud build agents for specific cloud images, provisioning replacements whenever the idle count falls below the target. Available for TeamCity 2024.12.3 or later and compatible with any supported cloud provider, it is installed through the JetBrains Marketplace and configured through REST API calls or the teamcity-cli. Organizations must balance faster build starts against the cost of cloud instances and build-agent licenses, while TeamCity respects configured limits on total agents. Targets can be adjusted dynamically, including through scheduled builds and Kotlin DSL to scale capacity up during working hours and down overnight, though reducing a target does not terminate already running agents. The plugin also exposes Prometheus-format utilization and saturation metrics to help teams analyze demand patterns and refine their agent capacity settings.

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