chore(chart-deps): update loki to version 18.12.1

[svcAPLBot]

This PR updates the dependency loki to version 18.12.1.

[svcAPLBot]

Comparison of Helm chart templating output:

# loki/templates/backend/clusterrole.yaml

# loki/templates/backend/clusterrolebinding.yaml

# loki/templates/compactor/service.yaml

# loki/templates/compactor/workload.yaml

@@ spec.template.spec.containers.compactor.image @@
! ± value change
- docker.io/grafana/loki:3.7.6
+ docker.io/grafana/loki:3.7.7

# loki/templates/config.yaml

# loki/templates/distributor/hpa.yaml

# loki/templates/distributor/service.yaml

# loki/templates/distributor/workload.yaml

@@ spec.template.spec.containers.distributor.image @@
! ± value change
- docker.io/grafana/loki:3.7.6
+ docker.io/grafana/loki:3.7.7

# loki/templates/gateway/configmap.yaml

# loki/templates/gateway/deployment.yaml

# loki/templates/gateway/hpa.yaml

# loki/templates/gateway/service.yaml

# loki/templates/gateway/serviceaccount.yaml

# loki/templates/index-gateway/service.yaml

# loki/templates/index-gateway/workload.yaml

@@ spec.template.spec.containers.index-gateway.image @@
! ± value change
- docker.io/grafana/loki:3.7.6
+ docker.io/grafana/loki:3.7.7

# loki/templates/ingester/hpa.yaml

# loki/templates/ingester/service.yaml

# loki/templates/ingester/workload.yaml

@@ spec.template.spec.containers.ingester.image @@
! ± value change
- docker.io/grafana/loki:3.7.6
+ docker.io/grafana/loki:3.7.7

# loki/templates/memcached/serviceaccount.yaml

# loki/templates/monitoring/servicemonitor.yaml

# loki/templates/querier/hpa.yaml

# loki/templates/querier/service.yaml

# loki/templates/querier/workload.yaml

@@ spec.template.spec.containers.querier.image @@
! ± value change
- docker.io/grafana/loki:3.7.6
+ docker.io/grafana/loki:3.7.7

# loki/templates/query-frontend/hpa.yaml

# loki/templates/query-frontend/service.yaml

# loki/templates/query-frontend/workload.yaml

@@ spec.template.spec.containers.query-frontend.image @@
! ± value change
- docker.io/grafana/loki:3.7.6
+ docker.io/grafana/loki:3.7.7

# loki/templates/query-scheduler/service.yaml

# loki/templates/query-scheduler/workload.yaml

@@ spec.template.spec.containers.query-scheduler.image @@
! ± value change
- docker.io/grafana/loki:3.7.6
+ docker.io/grafana/loki:3.7.7

# loki/templates/runtime-configmap.yaml

# loki/templates/service-memberlist.yaml

# loki/templates/serviceaccount.yaml

# otomi-api/templates/core-config.yaml

@@ data.core.yaml @@
! ± value change in multiline text (one insert, one deletion)
  adminApps:
  - deps:
    - prometheus
    name: alertmanager
  
  [364 lines unchanged)]
  
      about: Loki is a horizontally-scalable, highly-available, multi-tenant log aggregation
        system inspired by Prometheus. It is designed to be very cost effective and
        easy to operate. It does not index the contents of the logs, but rather a set
        of labels for each log stream.
-     appVersion: 3.7.6
+     appVersion: 3.7.7
      dependencies: Prometheus, Grafana, OTel
      integration: Loki can be activated to aggregate all the container logs on the
        platform and store them in a storage endpoint of choice (defaults to PVC). When
        App Platform is configured in multi-tenancy mode, logs will be split-up between
  
  [221 lines unchanged)]
  
    path: /explore?orgId=1&left=%7B"datasource":"loki","queries":%5B%7B"refId":"A","expr":"","queryType":"range","datasource":%7B"type":"loki","uid":"loki"%7D%7D%5D,"range":%7B"from":"now-1h","to":"now"%7D%7D
    useHost: grafana
  - name: tekton
    ownHost: true

# otomi-api/templates/deployment.yaml

# rabbitmq-cluster-operator/templates/messaging-topology-operator/validating-webhook-configuration.yaml

# values-repo.yaml

[Copilot]

🔵 Needs a closer look

Helm chart dependency upgrades can introduce broad rendered-manifest and behavioral changes that should be validated via render-diff/template validation before approval.

Pull request overview

This PR bumps the bundled Grafana Loki Helm chart dependency to 18.12.1 (and Loki appVersion to 3.7.7) within APL Core’s charts/ dependency set, and adjusts chart templates/values accordingly.

Changes:

• Update Loki chart version to 18.12.1 and appVersion to 3.7.7 (plus propagate the appVersion to apps.yaml).
• Update image tags in Loki chart values for access-log-exporter and k8s-sidecar.
• Refactor memcached PodDisruptionBudget templating to reuse the shared loki.pdb helper with a custom component label.

File summaries

File	Description
charts/loki/values.yaml	Updates container image tags used by Loki chart components.
charts/loki/templates/memcached/_memcached-pdb.tpl	Switches memcached PDB rendering to the shared loki.pdb helper while preserving the memcached-specific component label.
charts/loki/templates/_pdb.tpl	Extends the shared PDB helper to support an overrideable componentLabel for labels/selectors.
charts/loki/Chart.yaml	Bumps Loki chart version and appVersion.
charts/dependencies.yaml	Updates the declared Loki chart dependency version to 18.12.1.
apps.yaml	Updates Loki metadata appVersion to 3.7.7.

Review details

• Files reviewed: 6/6 changed files
• Comments generated: 0
• Review effort level: Lite

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