thermograph/observability/alloy/docker-compose.agent.beta.yml

# Overlay for vps2 ONLY — the node that runs two environments.
#
#   docker compose -f docker-compose.agent.yml -f docker-compose.agent.beta.yml up -d
#
# Adds beta's applogs volume at /applogs-beta, which config.alloy reads as a
# separate source and labels host="beta". Everything else — the Docker socket,
# the Caddy logs, the primary /applogs mount — comes from the base file.
#
# This is an overlay rather than another variable in the base file because the
# /applogs-beta source is labelled beta UNCONDITIONALLY. On a node where beta
# does not run, there is no correct volume to point it at: aiming it at the
# node's own logs would republish them as beta, manufacturing data for an
# environment that isn't there. "Absent" is the only honest configuration, and
# a missing overlay expresses that exactly.

services:
  alloy:
    volumes:
      - beta_applogs:/applogs-beta:ro

volumes:
  beta_applogs:
    external: true
    name: ${BETA_APPLOGS_VOLUME:?set BETA_APPLOGS_VOLUME (thermograph-beta_applogs)}