enhancement(helm): add note in resources section regarding max block duration

Signed-off-by: Conor Evans <coevans@tcd.ie>

Author: conorevans

operations/phlare/helm/phlare/values.yaml

@@ -66,7 +66,12 @@ phlare:
     # We usually recommend not to specify default resources and to leave this as a conscious
     # choice for the user. This also increases chances charts run on environments with little
     # resources, such as Minikube. If you do want to specify resources, uncomment the following
-    # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
+    # lines, adjust them as necessary, and remove the curly braces after 'resources'.
+    #
+    # Note that if memory consumption is higher than you would like, you can decrease the interval
+    # that profiles are written into blocks by setting `-phlaredb.max-block-duration` in the `extraArgs`
+    # stanza. By default, it is set to 3h - override it with `-phlaredb.max-block-duration=30m`, for example.
+    #
     # limits:
     #   cpu: 100m
     #   memory: 128Mi