feat: add LGTM compose for the observability VM

WP-10(Terraform 설계서 6.10, 실험·앱 설계서 4.1). Mimir 3.2.1(monolithic, GCS
prefix blocks/ruler/alertmanager), Loki 3.7.8(tsdb v13, GCS), Tempo 3.0.3(OTLP
4317/4318, GCS), Grafana 13.2.2(데이터소스 Mimir·Loki·Tempo 프로비저닝). 오브젝트
스토리지는 VM SA의 ADC로 인증(키 파일 없음). Grafana 관리자 비밀번호는 Secret Manager
selfheal-grafana-admin에서 실행 시 취득. 알림 규칙 8건은 WP-14에서 추가.
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seon committed 2026-09-24 01:18:33 +09:00
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# Tempo single binary, OTLP gRPC 4317 / HTTP 4318, GCS backend via the VM service account (ADC).
server:
http_listen_port: 3200
log_level: warn
distributor:
receivers:
otlp:
protocols:
grpc:
endpoint: 0.0.0.0:4317
http:
endpoint: 0.0.0.0:4318
storage:
trace:
backend: gcs
gcs:
bucket_name: selfheal-cms-d-414903-tempo
wal:
path: /var/tempo/wal
local:
path: /var/tempo/blocks
compactor:
compaction:
block_retention: 168h