Manage a fleet of Grafana Alloy collectors with Fleet Management — author Alloy pipelines once, target them via attribute matchers (env="production", regex region=~"us-.*"), push remotely via OpAMP without restarting collectors. Covers pipeline create / update / matcher RPCs, collector attribute API, remotecfg bootstrap block (standalone + Helm), pre-deploy alloy fmt validation, the local Alloy UI at port 12345 for component health, and post-deploy REMOTE_CONFIG_STATUS_APPLIED verification. Use when standing up a Cloud Alloy fleet, pushing a config change to 200 collectors, hunting why one collector shows REMOTE_CONFIG_STATUS_FAILED, validating River syntax before saving, or wiring discovery.kubernetes → prometheus.remote_write — even when the user says "configure Alloy", "remote config the collectors", "push pipeline", "OpAMP", "collector is unhealthy", or "manage agent config centrally" without naming Fleet Management.