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+---
+title: "Ruler High Availability"
+linkTitle: "Ruler High Availability"
+weight: 1
+slug: ruler-high-availability
+---
+
+- Author: [Anand Rajagopal](https://github.com/rajagopalanand)
+- Date: Aug 2024
+- Status: Proposed
+---
+
+## Problem
+
+Rulers in Cortex currently run with a replication factor of 1, wherein each RuleGroup is assigned to exactly 1 ruler.  This lack of redundancy creates the following risks:
+
+- Rule group evaluation
+    - Missed evaluations due to a ruler outage, possibly caused by a deployment, noisy neighbour, hardware failure, etc.
+    - Missed evaluations due to a ruler brownout due to other tenant rule groups sharing the same ruler (noisy neighbour)
+- API
+  - Inconsistent API results during resharding (e.g. due to a deployment) when rulers are in a transition state loading rule groups
+
+This proposal attempts to mitigate the above risks by enabling a ruler replication factor of greater than 1, allowing multiple rulers to evaluate the same rule group — effectively.
+
+## Proposal
+
+### Make ReplicationFactor configurable
+
+ReplicationFactor in Ruler is currently hardcoded to 1.  Making this a configurable parameter is the first step to enabling HA in ruler.  The parameter value will be 1 by default. To enable Ruler HA for rule group evaluation, a new flag will be created
+
+A replication factor greater than 1 will result in the following
+
+ - Ring will pick R rulers for a rule group where R=RF
+ - The primary ruler (R1), when active, will take ownership of the rule group
+ - Non-primary ruler R2 will check if R1 is active. If R1 is not active, R2 will take ownership of the rule group
+ - Non-primary ruler R3 (if RF=3) will check if R1 and R2 are active. If they are both inactive/unhealthy, then R3 will take owership of the rule group
+ - Non-primary rulers will drop their ownership when R1 becomes active after an outage
+
+With this redundancy, the maximum duration of missed evaluations will be limited to the sync interval of the rule groups, reducing the impact of primary Ruler unavailability.
+
+### Prometheus change
+
+No Prometheus change is required for this proposal
+
+### API HA
+
+An interim solution is addressed in this [#5773](https://github.com/cortexproject/cortex/issues/5773) PR. This will be modified such that the replicas will return both active and passive rule groups and the API handler will continue to de-duplicate the results.
+The difference is that after Ruler HA, the replicas could potentially return proper rule group state if those replicas evaluated the rule group
+
+PRs:
+
+* For Rule evaluation [#6129](https://github.com/cortexproject/cortex/pull/6129)
+* For API HA [#5773](https://github.com/cortexproject/cortex/issues/5773)
diff --git a/docs/proposals/ruler-ha.md b/docs/proposals/ruler-ha.md
index 5e874e1ce0f..87d9d1b5828 100644
--- a/docs/proposals/ruler-ha.md
+++ b/docs/proposals/ruler-ha.md
@@ -7,11 +7,13 @@ slug: ruler-ha
 
 - Author: [Soon-Ping Phang](https://github.com/soonping-amzn)
 - Date: June 2022
-- Status: Proposed
+- Status: Deprecated
 ---
 
 ## Introduction
 
+_This proposal is deprecated in favor of the new [proposal](./ruler-ha-new.md)_
+
 This proposal consolidates multiple existing PRs from the AWS team working on this feature, as well as future work needed to complete support.  The hope is that a more holistic view will make for more productive discussion and review of the individual changes, as well as provide better tracking of overall progress.
 
 The original issue is [#4435](https://github.com/cortexproject/cortex/issues/4435).