Allow setting remote write default parameters

class/defaults.yml

@@ -79,6 +79,11 @@ parameters:
         retention: 8d
         volumeClaimTemplate: ${openshift4_monitoring:configs:prometheusK8s:volumeClaimTemplate}
       thanosRuler: {}
+
+    remoteWriteDefaults:
+      cluster: {}
+      userWorkload: {}
+
     alertManagerConfig:
       route:
         group_wait: 0s

component/main.jsonnet

@@ -50,7 +50,7 @@ then remoteWriteConfig {
 }
 else remoteWriteConfig;
 
-local patchRemoteWrite(promConfig) = promConfig {
+local patchRemoteWrite(promConfig, defaults) = promConfig {
   _remoteWrite+:: {},
 } + {
   local rwd = super._remoteWrite,
@@ -59,6 +59,11 @@ local patchRemoteWrite(promConfig) = promConfig {
     function(name) transformRelabelConfigs(rwd[name] { name: name }),
     std.objectFields(rwd)
   ),
+} + {
+  remoteWrite: std.map(
+    function(rw) defaults + com.makeMergeable(rw),
+    super.remoteWrite,
+  ),
 };
 
 local customRules =
@@ -80,7 +85,7 @@ local customRules =
           } + std.mapWithKey(
             function(field, value) value + params.defaultConfig,
             params.configs {
-              prometheusK8s: patchRemoteWrite(super.prometheusK8s),
+              prometheusK8s: patchRemoteWrite(super.prometheusK8s, params.remoteWriteDefaults.cluster),
             }
           ),
         ),
@@ -96,7 +101,7 @@ local customRules =
           std.mapWithKey(
             function(field, value) value + params.defaultConfig,
             params.configsUserWorkload {
-              prometheus: patchRemoteWrite(super.prometheus),
+              prometheus: patchRemoteWrite(super.prometheus, params.remoteWriteDefaults.userWorkload),
             }
           )
         ),

docs/modules/ROOT/pages/references/parameters.adoc

@@ -711,3 +711,31 @@ default:: `{}`
 A dict of secrets to create in the namespace.
 The key is the name of the secret, the value is the content of the secret.
 The value must be a dict with a key `stringData` which is a dict of key/value pairs to add to the secret.
+
+== `remoteWriteDefaults`
+
+[horizontal]
+type:: dict
+default::
++
+[source,yaml]
+----
+remoteWriteDefaults:
+  cluster: {}
+  userWorkload: {}
+----
+example::
++
+[source,yaml]
+----
+remoteWriteDefaults:
+  cluster:
+    queueConfig:
+      maxShards: 80
+  userWorkload:
+    queueConfig:
+      maxShards: 20
+----
+
+A dict of default remote write configurations for the Prometheus component.
+Those values are merged into each remote write configuration in `configs.prometheusK8s.remoteWrite` and `configsUserWorkload.prometheus.remoteWrite`.

tests/golden/remote-write/openshift4-monitoring/openshift4-monitoring/10_configmap.yaml

@@ -32,6 +32,9 @@ data:
         "node-role.kubernetes.io/infra": ""
       "remoteWrite":
       - "name": "backwards-compatibility"
+        "queueConfig":
+          "maxShards": 80
+          "minShards": 5
       - "basicAuth":
           "password":
             "key": "password"
@@ -42,6 +45,8 @@ data:
         "headers":
           "X-Scope-OrgID": "example"
         "name": "example"
+        "queueConfig":
+          "maxShards": 70
         "url": "https://prometheus.example.com/api/v1/write"
         "writeRelabelConfigs":
         - "action": "keep"

tests/golden/remote-write/openshift4-monitoring/openshift4-monitoring/10_configmap_user_workload.yaml

@@ -21,6 +21,8 @@ data:
         "node-role.kubernetes.io/infra": ""
       "remoteWrite":
       - "name": "backwards-compatibility-user"
+        "queueConfig":
+          "maxShards": 20
       - "basicAuth":
           "password":
             "key": "password"
@@ -31,6 +33,8 @@ data:
         "headers":
           "X-Scope-OrgID": "customer"
         "name": "example"
+        "queueConfig":
+          "maxShards": 20
         "url": "https://user-prometheus.example.com/api/v1/write"
         "writeRelabelConfigs":
         - "action": "keep"

tests/remote-write.yml

@@ -23,10 +23,20 @@ parameters:
           username: prometheus
           password: prometheus
 
+    remoteWriteDefaults:
+      cluster:
+        queueConfig:
+          maxShards: 80
+      userWorkload:
+        queueConfig:
+          maxShards: 20
+
     configs:
       prometheusK8s:
         remoteWrite:
           - name: backwards-compatibility
+            queueConfig:
+              minShards: 5
         _remoteWrite:
           example:
             url: https://prometheus.example.com/api/v1/write
@@ -52,6 +62,8 @@ parameters:
               password:
                 name: remote-write
                 key: password
+            queueConfig:
+              maxShards: 70
 
     configsUserWorkload:
       prometheus: