Support patching upstream alert rules (#156)

class/defaults.yml

@@ -12,11 +12,6 @@ parameters:
     channel: 'stable-${openshift4_logging:version}'
     alerts: 'release-${openshift4_logging:version}'
 
-    ignore_alerts:
-      - ElasticsearchHighFileDescriptorUsage
-      - ElasticsearchOperatorCSVNotSuccessful
-      - FluentdQueueLengthIncreasing
-
     components:
       lokistack:
         enabled: true
@@ -109,6 +104,15 @@ parameters:
         schedule: '*/10 * * * *'
         sleep_time: 2m
 
+    ignore_alerts:
+      - ElasticsearchHighFileDescriptorUsage
+      - ElasticsearchOperatorCSVNotSuccessful
+      - FluentdQueueLengthIncreasing
+
+    patch_alerts:
+      FluentdQueueLengthIncreasing:
+        for: '12h'
+
   openshift4_elasticsearch_operator:
     targetNamespaces:
       - ${openshift4_logging:namespace}

component/alertrules.libsonnet

@@ -41,11 +41,7 @@ local ignore_alerts = std.set(
 // Provide partial objects for alert rules that need to be tuned compared to
 // upstream. The keys in this object correspond to the `alert` field of the
 // rule for which the patch is intended.
-local patch_alerts = {
-  FluentdQueueLengthIncreasing: {
-    'for': '12h',
-  },
-};
+local patch_alerts = params.patch_alerts;
 
 local loadFile(file) =
   local fpath = 'openshift4-logging/component/extracted_alerts/%s/%s' % [ params.alerts, file ];

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

@@ -80,6 +80,22 @@ This parameter can be used to disable alerts provided by openshift cluster-loggi
 The component supports removing entries in this parameter by providing the entry prefixed with `~`.
 
 
+== `patch_alerts`
+
+[horizontal]
+type:: dictionary
+default::
++
+[source,yaml]
+----
+patch_alerts:
+  FluentdQueueLengthIncreasing:
+    for: '12h'
+----
+
+The parameter patch_alerts allows users to customize upstream alerts.
+
+
 == `components.elasticsearch`
 
 [horizontal]