puts circulars kafka stuff behind feature flag

app/components/NoticeTypeCheckboxes/NoticeTypeCheckboxes.tsx

@@ -10,6 +10,7 @@ import { useState } from 'react'
 import type { NoticeFormat } from '../NoticeFormat'
 import { NestedCheckboxes } from '../nested-checkboxes/NestedCheckboxes'
 import { triggerRate } from './rates'
+import { useFeature } from '~/root'
 
 function humanizedCount(count: number, singular: string, plural?: string) {
   const noun = count === 1 ? singular : plural ?? `${singular}s`
@@ -182,8 +183,7 @@ const NoticeTypeLinks: { [key: string]: string | undefined } = {
   Other: undefined,
 }
 
-const JsonNoticeTypes = {
-  Circulars: ['gcn.circulars'],
+const JsonNoticeTypes: { [key: string]: string[] } = {
   IceCube: ['gcn.notices.icecube.lvk_nu_track_search'],
   LVK: ['igwn.gwalert'],
   Swift: ['gcn.notices.swift.bat.guano'],
@@ -213,6 +213,9 @@ export function NoticeTypeCheckboxes({
   const [selectedCounter, setSelectedCounter] = useState(0)
   const [alertEstimate, setAlertEstimate] = useState(0)
 
+  if (useFeature('CIRCULARS_KAFKA'))
+    JsonNoticeTypes['Circulars'] = ['gcn.circulars']
+
   const counterfunction = (childRef: HTMLInputElement) => {
     if (childRef.checked) {
       userSelected.add(childRef.name)

app/table-streams/circulars/index.ts

@@ -18,7 +18,7 @@ import type {
 } from 'aws-lambda'
 
 import { sendEmailBulk } from '~/lib/email.server'
-import { origin } from '~/lib/env.server'
+import { feature, origin } from '~/lib/env.server'
 import { send as sendKafka } from '~/lib/kafka.server'
 import { createTriggerHandler } from '~/lib/lambdaTrigger.server'
 import type { Circular } from '~/routes/circulars/circulars.lib'
@@ -123,9 +123,11 @@ export const handler = createTriggerHandler(
       if (eventName === 'INSERT') {
         promises.push(send(circular))
         const { sub, ...cleanedCircular } = circular
-        promises.push(
-          sendKafka('gcn.circulars', JSON.stringify(cleanedCircular))
-        )
+        if (feature('CIRCULARS_KAFKA')) {
+          promises.push(
+            sendKafka('gcn.circulars', JSON.stringify(cleanedCircular))
+          )
+        }
       }
     }