Upgrading loki-stack

helm -n monitoring upgrade loki grafana/loki-stack -f ./loki-stack-values.yaml

helm ls -n monitoring --selector name=loki
NAME    NAMESPACE       REVISION        UPDATED                                 STATUS          CHART                   APP VERSION
loki    monitoring      4               2022-02-04 09:06:24.459771 +0900 JST    deployed        loki-stack-2.6.0        v2.1.0