diff --git a/config-schema/package.json b/config-schema/package.json
index cee1cfa70..0b0487255 100644
--- a/config-schema/package.json
+++ b/config-schema/package.json
@@ -24,6 +24,7 @@
   "devDependencies": {
     "@biomejs/biome": "1.9.4",
     "@types/node": "^17.0.21",
+    "jest": "27.2.4",
     "typescript": "^4.9.5"
   },
   "dependencies": {
diff --git a/config-schema/src/commonSchema.ts b/config-schema/src/commonSchema.ts
index 3f7b0a13e..bee046c7a 100644
--- a/config-schema/src/commonSchema.ts
+++ b/config-schema/src/commonSchema.ts
@@ -21,12 +21,6 @@ export const browserUrls = Joi.array()
   .required()
   .description('All URLs need to have same protocol to prevent mixed block errors')
 
-export const DECAY_START_TIME = Joi.date()
-  .iso() // ISO 8601 format for date validation
-  .description('The start time for decay, expected in ISO 8601 format (e.g. 2021-05-13T17:46:31Z)')
-  .default(new Date('2021-05-13T17:46:31Z')) // default to the specified date if not provided
-  .required()
-
 export const COMMUNITY_URL = Joi.string()
   .uri({ scheme: ['http', 'https'] })
   .custom((value: string, helpers: Joi.CustomHelpers<string>) => {
@@ -131,6 +125,13 @@ export const LOG4JS_CONFIG = Joi.string()
   .default('log4js-config.json')
   .required()
 
+export const LOG4JS_CONFIG_PLACEHOLDER = Joi.string()
+  .pattern(/^[a-zA-Z0-9-_]+(%v)?\.json$/)
+  .message('LOG4JS_CONFIG_PLACEHOLDER must be a valid filename ending with .json can contain %v as API Version placeholder before ending')
+  .description('config file name for log4js config file')
+  .default('log4js-config.json')
+  .required()
+
 export const LOG_FILES_BASE_PATH = Joi.string()
   .pattern(/^[a-zA-Z0-9-_\/\.]+$/)
   .message('LOG_FILES_BASE_PATH must be a valid folder name, relative or absolute')
diff --git a/config-schema/src/const.ts b/config-schema/src/const.ts
new file mode 100644
index 000000000..87df0f804
--- /dev/null
+++ b/config-schema/src/const.ts
@@ -0,0 +1 @@
+export const DECAY_START_TIME = new Date('2021-05-13T17:46:31Z')
\ No newline at end of file
diff --git a/config-schema/src/index.ts b/config-schema/src/index.ts
index c2ad9fc96..9c7c32653 100644
--- a/config-schema/src/index.ts
+++ b/config-schema/src/index.ts
@@ -2,4 +2,6 @@ import 'source-map-support/register'
 export * from './commonSchema'
 export { DatabaseConfigSchema } from './DatabaseConfigSchema'
 export { validate } from './validate'
-export { createLog4jsConfig, type Category, initLogger, defaultCategory } from './log4js-config'
+export type { LogLevel, Category } from './log4js-config'
+export { createLog4jsConfig, initLogger, defaultCategory } from './log4js-config'
+export { DECAY_START_TIME } from './const'
diff --git a/config-schema/src/log4js-config/coloredContext.ts b/config-schema/src/log4js-config/coloredContext.ts
index a221c7c9d..21a2d7b28 100644
--- a/config-schema/src/log4js-config/coloredContext.ts
+++ b/config-schema/src/log4js-config/coloredContext.ts
@@ -5,6 +5,7 @@ import { LogLevel } from './types'
 export type coloredContextLayoutConfig = {
   withStack?: LogLevel | boolean
   withFile?: LogLevel | boolean
+  withLine?: LogLevel | boolean
 }
 
 function colorize(str: string, level: Level): string {
@@ -66,12 +67,35 @@ function isEnabledByLogLevel(eventLogLevel: Level, targetLogLevel?: LogLevel | b
   return eventLogLevel.isGreaterThanOrEqualTo(targetLogLevel)
 }
 
+enum DetailKind {
+  Callstack = 'callstack',
+  File = 'file',
+  Line = 'line',
+}
+function resolveDetailKind(logEvent: LoggingEvent, config: coloredContextLayoutConfig): DetailKind | undefined {
+  if (logEvent.callStack && isEnabledByLogLevel(logEvent.level, config.withStack)) {
+    return DetailKind.Callstack
+  }
+  if (isEnabledByLogLevel(logEvent.level, config.withFile)) {
+    return DetailKind.File
+  }
+  if (isEnabledByLogLevel(logEvent.level, config.withLine)) {
+    return DetailKind.Line
+  }
+  return undefined
+}
+
 export function createColoredContextLayout(config: coloredContextLayoutConfig) {
   return (logEvent: LoggingEvent) => {
     const result: string[] = []
+    const detailKind = resolveDetailKind(logEvent, config)
+    let categoryName = logEvent.categoryName
+    if (detailKind === DetailKind.Line) {
+      categoryName += `:${logEvent.lineNumber}`
+    }
     result.push(
       colorize(
-        `[${logEvent.startTime.toISOString()}] [${logEvent.level}] ${logEvent.categoryName} -`,
+        `[${logEvent.startTime.toISOString()}] [${logEvent.level}] ${categoryName} -`,
         logEvent.level,
       ),
     )
@@ -79,12 +103,11 @@ export function createColoredContextLayout(config: coloredContextLayoutConfig) {
       result.push(composeContextString(logEvent.context))
     }
     result.push(composeDataString(logEvent.data))
-    const showCallstack =
-      logEvent.callStack && isEnabledByLogLevel(logEvent.level, config.withStack)
-    if (!showCallstack && isEnabledByLogLevel(logEvent.level, config.withFile)) {
+    
+    if (detailKind === DetailKind.File) {
       result.push(`\n    at ${logEvent.fileName}:${logEvent.lineNumber}`)
     }
-    if (showCallstack) {
+    if (detailKind === DetailKind.Callstack) {
       result.push(`\n${logEvent.callStack}`)
     }
     return result.join(' ')
diff --git a/config-schema/src/log4js-config/index.ts b/config-schema/src/log4js-config/index.ts
index 9652726ce..18699639f 100644
--- a/config-schema/src/log4js-config/index.ts
+++ b/config-schema/src/log4js-config/index.ts
@@ -33,7 +33,7 @@ export function createLog4jsConfig(categories: Category[], basePath?: string): C
     customFileAppenders.push({
       name: category.name,
       filename: category.filename,
-      withFile: true,
+      withLine: true,
       withStack: 'error',
     })
     // needed by log4js, show all error message accidentally without (proper) Category
diff --git a/config-schema/src/log4js-config/types/CustomFileAppender.ts b/config-schema/src/log4js-config/types/CustomFileAppender.ts
index f2281805e..46c292349 100644
--- a/config-schema/src/log4js-config/types/CustomFileAppender.ts
+++ b/config-schema/src/log4js-config/types/CustomFileAppender.ts
@@ -22,10 +22,14 @@ import { LogLevel } from './LogLevel'
  *   { name: 'warn', filename: 'warn.log', withStack: 'debug' },
  * ])
  * ```
+ * if stack is shown, no file and no line is shown, because it is already in the stack trace
+ * if file:line is shown, no extra line is shown
+ * line will be shown after category name:line
  */
 export type CustomFileAppender = {
   name: string
   filename?: string
   withStack?: LogLevel | boolean // with stack if boolean or from log level on or above
   withFile?: LogLevel | boolean // with filename and line if boolean or from log level on or above
+  withLine?: LogLevel | boolean // with line if boolean or from log level on or above
 }