fix: limit relations amount

.changeset/gold-terms-give.md

@@ -0,0 +1,5 @@
+---
+'@dweber019/backstage-plugin-missing-entity-backend': patch
+---
+
+Limit amount of relations per entity to 1000.

plugins/missing-entity-backend/README.md

@@ -61,3 +61,9 @@ The default setup will only check missing entities once when processed.
 If you want this process to also refresh the data you can do so by adding the `age`.
 
 It's recommended that if you choose to use this configuration to set it to 3 to update stale data.
+
+## Limitations
+
+### Relation limit
+
+Currently, we only process the first 1000 relation per entity.

plugins/missing-entity-backend/src/api/MissingEntityBackendClient.ts

@@ -239,11 +239,11 @@ export class MissingEntityBackendClient implements MissingEntityBackendApi {
       entityRefRelations?.length > 1
     ) {
       const relatedEntities = await this.catalogApi.getEntitiesByRefs({
-        entityRefs: entityRefRelations,
+        entityRefs: entityRefRelations.slice(0, 1000),
         fields: ['kind', 'metadata.name', 'metadata.namespace'],
       }, { token });
 
-      entityResults.missingEntityRefs = entityRefRelations.filter(
+      entityResults.missingEntityRefs = entityRefRelations.slice(0, 1000).filter(
         (_, index) => relatedEntities.items[index] === undefined,
       );
     }