[jaeger] Major refactoring of templates to simplify (#702)

# [jaeger] Major refactoring for Jaeger v2

## Summary

This PR modernizes the Jaeger Helm chart for **Jaeger v2**, which is
built on the OpenTelemetry Collector framework. It removes legacy v1
components and consolidates to a single deployment model with
simplified, more maintainable templates.

## Breaking Changes ⚠️

### Values Schema Changes
- **`allInOne:` → `jaeger:`** - The main deployment section has been
renamed
- **`schema:` section removed** - Cassandra schema job no longer needed
(Jaeger v2 handles schema internally)
- **`hotrod:` section removed** - Demo app removed from chart
- **Storage configuration** moved to `config.extensions.jaeger_storage`
using native OTel Collector syntax

### Migration Guide

```yaml
# Before (v1)
allInOne:
  image:
    tag: "1.x.x"

# After (v2)
jaeger:
  image:
    tag: "2.13.0"
```

For storage configuration, see the updated README.md examples.

## Changes

### Templates Removed (Legacy v1 Components)
- `allinone-agent-svc.yaml`, `allinone-collector-svc.yaml`,
`allinone-query-svc.yaml` - Separate services
- `cassandra-schema-job.yaml` & `cassandra-schema-sa.yaml` - Schema
initialization
- `elasticsearch-secret.yaml` - ES secret management
- `es-index-cleaner-cronjob.yaml`, `es-rollover-cronjob.yaml`,
`es-lookback-cronjob.yaml` & their SA files - Now in es-maintenance.yaml
- `hotrod-*.yaml` - Demo application
- `spark-sa.yaml` - Merged into spark-dependencies.yaml

### Templates Renamed
- allinone-deploy.yaml → jaeger-deploy.yaml
- allinone-sa.yaml → `jaeger-sa.yaml`
- allinone-ing.yaml → `jaeger-ing.yaml`
- allinone-configmap.yaml → `jaeger-configmap.yaml`
- `spark-cronjob.yaml` → `spark-dependencies.yaml`

### Templates Added/Consolidated
- service.yaml - Unified service exposing all ports (agent, collector,
query, OTLP)
- `es-maintenance.yaml` - Consolidated ES maintenance jobs with their
ServiceAccounts

### Helper Functions Cleaned Up (_helpers.tpl)
Removed ~100 lines of unused helpers including schema, hotrod, and
legacy ES helpers.

### values.yaml Improvements
- Clear section headers distinguishing `storage.*` (connection settings)
from top-level `cassandra:`/`elasticsearch:` (subchart provisioning)
- Removed deprecated/unused settings
- Added documentation comments throughout

### Documentation
- Completely rewritten README.md for Jaeger v2
- Added "Overriding the Jaeger Version" section
- Added Spark Dependencies README link
- Clarified Cassandra is external-only

### Bug Fixes
- Fixed duplicate annotations block in service.yaml
- Fixed storage-configmap.yaml to render `Values.config` directly

## Stats
- **32 files changed**
- **+700 insertions, -1,696 deletions** (net ~1,000 lines removed)

## Testing
- [x] `helm lint charts/jaeger` passes
- [x] `make test` passes (deploys to local k8s)
- [x] Templates render correctly for memory, elasticsearch, and
cassandra storage types

## Checklist
- [x] Chart version bumped (4.1.5 → 4.2.0)
- [x] README.md updated
- [x] values.yaml documented
- [x] .gitignore updated (added .vscode/)
- [x] All commits signed off (DCO)

---------

Signed-off-by: Jonah Kowall <[email protected]>

Author: jkowall

.gitignore

@@ -2,3 +2,6 @@
 /charts/*/charts
 /charts/*/requirements.lock
 /charts/*/*.tgz
+
+# IDE/Editor settings
+.vscode/

Makefile

@@ -21,6 +21,8 @@ test-es:
 		--set elasticsearch.data.replicaCount=0 \
 		--set elasticsearch.coordinating.replicaCount=0 \
 		--set elasticsearch.ingest.replicaCount=0 \
-		--set elasticsearch.clusterHealthCheckParams=wait_for_status=yellow&timeout=1s \
+		--set elasticsearch.clusterHealthCheckParams=wait_for_status=yellow&timeout=10s \
+		--set elasticsearch.readinessProbe.initialDelaySeconds=60 \
+		--set elasticsearch.readinessProbe.failureThreshold=10 \
 		--set storage.elasticsearch.scheme=https \
 		--set storage.elasticsearch.tls.insecure=true"

charts/jaeger/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: 2.13.0
 description: A Jaeger Helm chart for Kubernetes
 name: jaeger
 type: application
-version: 4.1.5
+version: 4.2.0
 # CronJobs require v1.21
 kubeVersion: ">= 1.21-0"
 keywords: