Configure Loki to use Ceph

Grafana Loki
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1 
loki:
  storage:
    type: s3
    bucketNames:
      chunks: loki-chunks
      ruler: loki-ruler
      admin: loki-admin
    s3:
      endpoint: rook-ceph-rgw-righive.rook-ceph.svc.cluster.local:80
      accessKeyId: ${AWS_ACCESS_KEY_ID}
      secretAccessKey: ${AWS_SECRET_ACCESS_KEY}
      s3ForcePathStyle: true
      insecure: true

I created 3 Ceph buckets loki-admin, loki-chunks, loki-ruler. Once the objectbcketclaim creates three buckets I have three kubernetes secrets having access key and access id (each corresponding to that bucket) creates in loki namespace. Now I’m confused which of these bucket credentials needs to set as AWS_SECRET_ACCESS_KEY and AWS_SECRET_ACCESS_KEY