Merge pull request #5668 from backstage/iameap/cache-improvements

Handle/log cache connection errors and allow integrators to pass custom handlers

.changeset/improbable-word-combination.md

@@ -0,0 +1,17 @@
+---
+'@backstage/backend-common': patch
+---
+
+All cache-related connection errors are now handled and logged by the cache manager. App Integrators may provide an optional error handler when instantiating the cache manager if custom error handling is needed.
+
+```typescript
+// Providing an error handler
+const cacheManager = CacheManager.fromConfig(config, {
+  onError: e => {
+    if (isSomehowUnrecoverable(e)) {
+      gracefullyShutThingsDown();
+      process.exit(1);
+    }
+  },
+});
+```