diff --git a/docs/configuration.md b/docs/configuration.md
index 92ed267e..328204a1 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -4,22 +4,22 @@ Lighter can be configured by using environment variables. Currently, Lighter sup
## Global properties
-| Property | Description | Default |
-|----------------------------------------|--------------------------------------------------------------------------------------------------------------------|---------------------------------|
-| LIGHTER_MAX_RUNNING_JOBS | Max running Batch jobs in parallel | 5 |
-| LIGHTER_MAX_STARTING_JOBS | Max starting Batch jobs in parallel | 5 |
-| LIGHTER_SPARK_HISTORY_SERVER_URL | Spark history server URL used on frontend | http://localhost/spark-history/ |
-| LIGHTER_EXTERNAL_LOGS_URL_TEMPLATE | Template for link to external logs | |
-| LIGHTER_PY_GATEWAY_PORT | Port for live Spark session communication | 25333 |
-| LIGHTER_URL | URL which can be used to access Lighter form Spark Job | http://lighter.spark:8080 |
-| LIGHTER_SESSION_TIMEOUT_MINUTES | Session lifetime in minutes (from last statement creation). Use negative value to disable | 90 |
-| LIGHTER_SESSION_TIMEOUT_ACTIVE | Should Lighter kill sessions with waiting statements (obsolete when `LIGHTER_SESSION_TIMEOUT_MINUTES` is negative) | false |
-| LIGHTER_STORAGE_JDBC_URL | JDBC url for lighter storage | jdbc:h2:mem:lighter |
-| LIGHTER_STORAGE_JDBC_USERNAME | JDBC username | sa |
-| LIGHTER_STORAGE_JDBC_PASSWORD | JDBC password | |
-| LIGHTER_STORAGE_JDBC_DRIVER_CLASS_NAME | JDBC driver class name | org.h2.Driver |
-| LIGHTER_BATCH_DEFAULT_CONF | Default `conf` props for batch applications (JSON)* | |
-| LIGHTER_SESSION_DEFAULT_CONF | Default `conf` props for session applications (JSON) | |
+| Property | Description | Default |
+|----------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------|
+| LIGHTER_MAX_RUNNING_JOBS | Max running Batch jobs in parallel | 5 |
+| LIGHTER_MAX_STARTING_JOBS | Max starting Batch jobs in parallel | 5 |
+| LIGHTER_SPARK_HISTORY_SERVER_URL | Spark history server URL used on the Lighter UI | http://localhost/spark-history/ |
+| LIGHTER_EXTERNAL_LOGS_URL_TEMPLATE | Template for link to external logs (Grafana, Graylog, etc.) used on the Lighter UI. Allowed placeholders: `{{id}}`, `{{appId}}`, `{{createdTs}}` | |
+| LIGHTER_PY_GATEWAY_PORT | Port for live Spark session communication | 25333 |
+| LIGHTER_URL | URL which can be used to access Lighter form Spark Job | http://lighter.spark:8080 |
+| LIGHTER_SESSION_TIMEOUT_MINUTES | Session lifetime in minutes (from last statement creation). Use negative value to disable | 90 |
+| LIGHTER_SESSION_TIMEOUT_ACTIVE | Should Lighter kill sessions with waiting statements (obsolete when `LIGHTER_SESSION_TIMEOUT_MINUTES` is negative) | false |
+| LIGHTER_STORAGE_JDBC_URL | JDBC url for lighter storage | jdbc:h2:mem:lighter |
+| LIGHTER_STORAGE_JDBC_USERNAME | JDBC username | sa |
+| LIGHTER_STORAGE_JDBC_PASSWORD | JDBC password | |
+| LIGHTER_STORAGE_JDBC_DRIVER_CLASS_NAME | JDBC driver class name | org.h2.Driver |
+| LIGHTER_BATCH_DEFAULT_CONF | Default `conf` props for batch applications (JSON)* | |
+| LIGHTER_SESSION_DEFAULT_CONF | Default `conf` props for session applications (JSON) | |
* default confs will be merged with confs provided in submit request, if property is defined in submit request, default will be ignored.
Example of `LIGHTER_BATCH_DEFAULT_CONF`: `{"spark.kubernetes.driverEnv.TEST1":"test1"}`.
@@ -37,13 +37,13 @@ Example of `LIGHTER_BATCH_DEFAULT_CONF`: `{"spark.kubernetes.driverEnv.TEST1":"t
## YARN configuration
-| Property | Description | Default |
-|---------------------------------|-------------------------------------------------------------------| --------------------------------- |
-| LIGHTER_YARN_ENABLED | Yarn enabled (Kubernetes should be disabled) | false |
-| LIGHTER_YARN_URL | Yarn API URL, `/ws/v1/cluster/` will be appended | |
-| HADOOP_CONF_DIR | Path to `core-site.xml`,`hdfs-site.xml` and `yarn-site.xml` files | |
-| LIGHTER_YARN_KERBEROS_PRINCIPAL | Kerberos principal used for job management* | |
-| LIGHTER_YARN_KERBEROS_KEYTAB | Kerberos keytab used for job management | |
+| Property | Description | Default |
+|---------------------------------|-------------------------------------------------------------------|---------|
+| LIGHTER_YARN_ENABLED | Yarn enabled (Kubernetes should be disabled) | false |
+| LIGHTER_YARN_URL | Yarn API URL, `/ws/v1/cluster/` will be appended | |
+| HADOOP_CONF_DIR | Path to `core-site.xml`,`hdfs-site.xml` and `yarn-site.xml` files | |
+| LIGHTER_YARN_KERBEROS_PRINCIPAL | Kerberos principal used for job management* | |
+| LIGHTER_YARN_KERBEROS_KEYTAB | Kerberos keytab used for job management | |
* Principal & Keytab provided in `LIGHTER_YARN_KERBEROS_PRINCIPAL` and `LIGHTER_YARN_KERBEROS_KEYTAB` will be used by spark job
as well, if `spark.kerberos.keytab` is not explicitly declared in `LIGHTER_BATCH_DEFAULT_CONF` or provided on submit request.