diff --git a/packages/backend-app-api/src/services/implementations/cache/cacheServiceFactory.ts b/packages/backend-app-api/src/services/implementations/cache/cacheServiceFactory.ts
index b91356a13a..cb4e04d574 100644
--- a/packages/backend-app-api/src/services/implementations/cache/cacheServiceFactory.ts
+++ b/packages/backend-app-api/src/services/implementations/cache/cacheServiceFactory.ts
@@ -25,10 +25,11 @@ export const cacheServiceFactory = createServiceFactory({
   service: coreServices.cache,
   deps: {
     config: coreServices.rootConfig,
+    logger: coreServices.rootLogger,
     plugin: coreServices.pluginMetadata,
   },
-  async createRootContext({ config }) {
-    return CacheManager.fromConfig(config);
+  async createRootContext({ config, logger }) {
+    return CacheManager.fromConfig(config, { logger });
   },
   async factory({ plugin }, manager) {
     return manager.forPlugin(plugin.getId()).getClient();
diff --git a/packages/backend-common/api-report.md b/packages/backend-common/api-report.md
index 42df32dc1d..650f50a159 100644
--- a/packages/backend-common/api-report.md
+++ b/packages/backend-common/api-report.md
@@ -218,7 +218,7 @@ export function cacheToPluginCacheManager(
   cache: CacheClient,
 ): PluginCacheManager;
 
-// @public
+// @public @deprecated
 export const coloredFormat: winston.Logform.Format;
 
 // @public
@@ -259,7 +259,7 @@ export function createLegacyAuthAdapters<
       : {}),
 >(options: TOptions): TAdapters;
 
-// @public
+// @public @deprecated
 export function createRootLogger(
   options?: winston.LoggerOptions,
   env?: NodeJS.ProcessEnv,
@@ -366,10 +366,10 @@ export class GerritUrlReader implements UrlReader {
   toString(): string;
 }
 
-// @public
+// @public @deprecated
 export function getRootLogger(): winston.Logger;
 
-// @public
+// @public @deprecated
 export function getVoidLogger(): winston.Logger;
 
 // @public @deprecated
@@ -815,7 +815,7 @@ export type ServiceBuilder = {
   start(): Promise<Server>;
 };
 
-// @public
+// @public @deprecated
 export function setRootLogger(newLogger: winston.Logger): void;
 
 // @public @deprecated
diff --git a/packages/backend-common/src/cache/CacheManager.ts b/packages/backend-common/src/cache/CacheManager.ts
index ec8a1d93f7..8af742be8c 100644
--- a/packages/backend-common/src/cache/CacheManager.ts
+++ b/packages/backend-common/src/cache/CacheManager.ts
@@ -72,6 +72,8 @@ export class CacheManager {
       config.getOptionalString('backend.cache.connection') || '';
     const useRedisSets =
       config.getOptionalBoolean('backend.cache.useRedisSets') ?? true;
+
+    // TODO: Make logger required and remove the default logger after moving this class to the `backstage-defaults`package
     const logger = (options.logger || getRootLogger()).child({
       type: 'cacheManager',
     });
diff --git a/packages/backend-common/src/logging/createRootLogger.ts b/packages/backend-common/src/logging/createRootLogger.ts
index f9a3ed4ba0..16554750ef 100644
--- a/packages/backend-common/src/logging/createRootLogger.ts
+++ b/packages/backend-common/src/logging/createRootLogger.ts
@@ -59,6 +59,8 @@ const colorizer = format.colorize();
  * Creates a pretty printed winston log formatter.
  *
  * @public
+ * @deprecated As we are going to deprecate the legacy backend, this formatter utility will be removed in the future.
+ * If you need to format logs in the new system, please use the `WinstonLogger.colorFormat()` from `@backstage/backend-app-api` instead.
  */
 export const coloredFormat = format.combine(
   format.timestamp(),
@@ -96,6 +98,9 @@ export const coloredFormat = format.combine(
  * instances passed to plugins etc, in a given backend.
  *
  * @public
+ * @deprecated As we are going to deprecate the legacy backend, this function will be removed in the future.
+ * If you need to create the root logger in the new system, please check out this documentation:
+ * https://backstage.io/docs/backend-system/core-services/logger
  */
 export function createRootLogger(
   options: winston.LoggerOptions = {},
diff --git a/packages/backend-common/src/logging/globalLoggers.ts b/packages/backend-common/src/logging/globalLoggers.ts
index 8b473db211..cbd5279d29 100644
--- a/packages/backend-common/src/logging/globalLoggers.ts
+++ b/packages/backend-common/src/logging/globalLoggers.ts
@@ -21,6 +21,8 @@ import { createRootLogger } from './createRootLogger';
  * A logger that just throws away all messages.
  *
  * @public
+ * @deprecated As we are going to deprecate the legacy backend, this function will be removed in the future.
+ * If you need to mock the root logger in the new system, please use `mockServices.logger.mock()` from `@backstage/test-utils` instead.
  */
 export function getVoidLogger(): winston.Logger {
   return winston.createLogger({
@@ -34,6 +36,9 @@ let rootLogger: winston.Logger;
  * Gets the current root logger.
  *
  * @public
+ * @deprecated As we are going to deprecate the legacy backend, this function will be removed in the future.
+ * If you need to get the root logger in the new system, please check out this documentation:
+ * https://backstage.io/docs/backend-system/core-services/logger
  */
 export function getRootLogger(): winston.Logger {
   if (!rootLogger) {
@@ -55,6 +60,9 @@ export function getRootLogger(): winston.Logger {
  * behavior, you would instead call {@link createRootLogger}.
  *
  * @public
+ * @deprecated As we are going to deprecate the legacy backend, this function will be removed in the future.
+ * If you need to set the root logger in the new system, please check out this documentation:
+ * https://backstage.io/docs/backend-system/core-services/logger
  */
 export function setRootLogger(newLogger: winston.Logger) {
   rootLogger = newLogger;
diff --git a/packages/backend-tasks/api-report.md b/packages/backend-tasks/api-report.md
index 00ef28c9ce..4bfda20c36 100644
--- a/packages/backend-tasks/api-report.md
+++ b/packages/backend-tasks/api-report.md
@@ -94,7 +94,7 @@ export class TaskScheduler {
     databaseManager: PluginDatabaseManager;
     logger: LoggerService;
   }): PluginTaskScheduler;
-  // (undocumented)
+  // @deprecated (undocumented)
   static fromConfig(
     config: Config,
     options?: {
diff --git a/packages/backend-tasks/src/tasks/TaskScheduler.ts b/packages/backend-tasks/src/tasks/TaskScheduler.ts
index 672c52cc10..cc589ea949 100644
--- a/packages/backend-tasks/src/tasks/TaskScheduler.ts
+++ b/packages/backend-tasks/src/tasks/TaskScheduler.ts
@@ -35,6 +35,10 @@ import { LoggerService } from '@backstage/backend-plugin-api';
  * @public
  */
 export class TaskScheduler {
+  /**
+   * @deprecated
+   * It is only used by the legacy backend system, and should not be used in the new backend system.
+   */
   static fromConfig(
     config: Config,
     options?: {