This task represents two streams of work:
1. The longer-term work associated with reducing #discussiontools' usage of the parser cache //and//
2. The near-term work of modifying the parser cache expiry to reduce its usage so the Editing Team can proceed with scaling #discussiontools features.
=== Plans
//This section contains the in-progress plan for reducing #discussiontools' usage of the parser cache.//
**Near-term plan of reducing parser cache usage**
|STEP[|DESCRIPTION|TICKET|STATUS
|---|---|---|---|---
|**Step 1a.** | Pre-deploy: Draft plan for interim mitigation with #performance-team and #DBA.| //(this one)// | ✅
|**Step 1b.** | Pre-deploy: Write down how #performance-team and #DBA monitors outcome.| T280602 | ✅
|**Step 2.** | Execute mitigation plan. | T280605 |
|**Step 3.**| Post-deploy: Evaluate impact on **site performance** (for at least 21 days). | T280606|
|**Step 4b.**| Post-deploy: Ramp up parser cache retention while keeping an eye on parser cache utilization. | T280604|
**Longer-term plan of decreasing #discussion-tools's usage of parser cache**
|Step|Description|Ticket|Notes
|---|---|---|---
| 1 | Avoid splitting parser cache on user language | T280295 |
| 2 | Avoid splitting parser cache on opt-out wikis | T279864 |
| 3 | Deploy to more wikis as opt-out | T275256 |