Expose metric delay processing metric

For performance reasons we might want to tweak this param
lets expose this via tripleo. The puppet changes were
added in this patch I5de5283d1b14e0bba63d6d9a440611914ba86ca4

Change-Id: I72f1fe3a47060fe37602a70b8a74fba72209127c
(cherry picked from commit e33e76684c)

puppet/services/gnocchi-base.yaml

@@ -22,6 +22,10 @@ parameters:
     default: 'mysql'
     description: The short name of the Gnocchi indexer backend to use.
     type: string
+  MetricProcessingDelay:
+    default: 30
+    description: Delay between processing metrics.
+    type: number
   GnocchiPassword:
     description: The password for the gnocchi service and db account.
     type: string
@@ -70,6 +74,7 @@ outputs:
               - '?bind_address='
               - "%{hiera('tripleo::profile::base::database::mysql::client_bind_address')}"
         gnocchi::db::sync::extra_opts: '--skip-storage --create-legacy-resource-types'
+        gnocchi::storage::metric_processing_delay: {get_param: MetricProcessingDelay}
         gnocchi::storage::swift::swift_user: 'service:gnocchi'
         gnocchi::storage::swift::swift_auth_version: 2
         gnocchi::storage::swift::swift_key: {get_param: GnocchiPassword}

releasenotes/notes/expose-metric-processing-delay-0c098d7ec0af0728.yaml

@@ -0,0 +1,3 @@
+---
+fixes:
+  - Expose metric_processing_delay to tweak gnocchi performance.