Do not override heapHeadroomPerNode by default

Trino sets the headroom to 30% of heap by default. Overriding it to 1GB
is error prone, as somebody may increase the heap size without adjusting
the headroom.

charts/trino/README.md

@@ -59,15 +59,15 @@ The following table lists the configurable parameters of the Trino chart and the
 | `coordinator.jvm.maxHeapSize` |  | `"8G"` |
 | `coordinator.jvm.gcMethod.type` |  | `"UseG1GC"` |
 | `coordinator.jvm.gcMethod.g1.heapRegionSize` |  | `"32M"` |
-| `coordinator.config.memory.heapHeadroomPerNode` |  | `"1GB"` |
+| `coordinator.config.memory.heapHeadroomPerNode` |  | `""` |
 | `coordinator.additionalJVMConfig` |  | `{}` |
 | `coordinator.resources` |  | `{}` |
 | `coordinator.livenessProbe` |  | `{}` |
 | `coordinator.readinessProbe` |  | `{}` |
 | `worker.jvm.maxHeapSize` |  | `"8G"` |
 | `worker.jvm.gcMethod.type` |  | `"UseG1GC"` |
 | `worker.jvm.gcMethod.g1.heapRegionSize` |  | `"32M"` |
-| `worker.config.memory.heapHeadroomPerNode` |  | `"1GB"` |
+| `worker.config.memory.heapHeadroomPerNode` |  | `""` |
 | `worker.additionalJVMConfig` |  | `{}` |
 | `worker.resources` |  | `{}` |
 | `worker.livenessProbe` |  | `{}` |

charts/trino/values.yaml

@@ -162,7 +162,7 @@ coordinator:
 
   config:
     memory:
-      heapHeadroomPerNode: "1GB"
+      heapHeadroomPerNode: ""
 
   additionalJVMConfig: {}
 
@@ -201,7 +201,7 @@ worker:
 
   config:
     memory:
-      heapHeadroomPerNode: "1GB"
+      heapHeadroomPerNode: ""
 
   additionalJVMConfig: {}