diff --git a/service_configuration_lib/spark_config.py b/service_configuration_lib/spark_config.py
index 1ae9bc4..cd0a22d 100644
--- a/service_configuration_lib/spark_config.py
+++ b/service_configuration_lib/spark_config.py
@@ -6,6 +6,7 @@
 import logging
 import math
 import os
+import re
 import time
 from typing import Any
 from typing import Dict
@@ -37,6 +38,7 @@
 
 NON_CONFIGURABLE_SPARK_OPTS = {
     'spark.master',
+    'spark.app.id',
     'spark.ui.port',
     'spark.mesos.principal',
     'spark.mesos.secret',
@@ -1076,6 +1078,11 @@ def get_spark_conf(
             _pick_random_port(PREFERRED_SPARK_UI_PORT),
         )
 
+        spark_conf = {**(spark_opts_from_env or {}), **_filter_user_spark_opts(user_spark_opts)}
+
+        if aws_creds[2] is not None:
+            spark_conf['spark.hadoop.fs.s3a.aws.credentials.provider'] = AWS_ENV_CREDENTIALS_PROVIDER
+
         # app_name from env is already appended port and time to make it unique
         app_name = (spark_opts_from_env or {}).get('spark.app.name')
         if not app_name:
@@ -1083,13 +1090,15 @@ def get_spark_conf(
             # from history server.
             app_name = f'{app_base_name}_{ui_port}_{int(time.time())}'
 
-        spark_conf = {**(spark_opts_from_env or {}), **_filter_user_spark_opts(user_spark_opts)}
-
-        if aws_creds[2] is not None:
-            spark_conf['spark.hadoop.fs.s3a.aws.credentials.provider'] = AWS_ENV_CREDENTIALS_PROVIDER
+        # Explicitly setting app id: replace special characters to '_' to make it consistent
+        # in all places for metric systems:
+        # - since in the Promehteus metrics endpoint those will be converted to '_'
+        # - while the 'spark-app-selector' executor pod label will keep the original app id
+        app_id = re.sub(r'[\.,-]', '_', app_name)
 
         spark_conf.update({
             'spark.app.name': app_name,
+            'spark.app.id': app_id,
             'spark.ui.port': str(ui_port),
         })
 
diff --git a/setup.py b/setup.py
index 1de2655..f262250 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
 
 setup(
     name='service-configuration-lib',
-    version='2.18.3',
+    version='2.18.4',
     provides=['service_configuration_lib'],
     description='Start, stop, and inspect Yelp SOA services',
     url='https://github.com/Yelp/service_configuration_lib',
diff --git a/tests/spark_config_test.py b/tests/spark_config_test.py
index 92b46aa..f99c5d9 100644
--- a/tests/spark_config_test.py
+++ b/tests/spark_config_test.py
@@ -2,6 +2,7 @@
 import itertools
 import json
 import os
+import re
 import sys
 from unittest import mock
 
@@ -1138,6 +1139,14 @@ def verify(output):
             return [key]
         return verify
 
+    @pytest.fixture
+    def assert_app_id(self):
+        def verify(output):
+            key = 'spark.app.id'
+            assert output[key] == re.sub(r'[\.,-]', '_', output['spark.app.name'])
+            return [key]
+        return verify
+
     @pytest.fixture
     def assert_mesos_conf(self):
         def verify(output):
@@ -1230,6 +1239,7 @@ def test_leaders_get_spark_conf_kubernetes(
         mock_time,
         assert_ui_port,
         assert_app_name,
+        assert_app_id,
         assert_kubernetes_conf,
         mock_log,
     ):
@@ -1262,6 +1272,7 @@ def test_leaders_get_spark_conf_kubernetes(
         verified_keys = set(
             assert_ui_port(output) +
             assert_app_name(output) +
+            assert_app_id(output) +
             assert_kubernetes_conf(output) +
             list(other_spark_opts.keys()) +
             list(mock_adjust_spark_requested_resources_kubernetes.return_value.keys()) +
@@ -1321,6 +1332,7 @@ def test_show_console_progress_jupyter(
         mock_time,
         assert_ui_port,
         assert_app_name,
+        assert_app_id,
         assert_local_conf,
         mock_log,
     ):
@@ -1361,6 +1373,7 @@ def test_local_spark(
         mock_time,
         assert_ui_port,
         assert_app_name,
+        assert_app_id,
         assert_local_conf,
         mock_log,
     ):
@@ -1385,6 +1398,7 @@ def test_local_spark(
         verified_keys = set(
             assert_ui_port(output) +
             assert_app_name(output) +
+            assert_app_id(output) +
             assert_local_conf(output) +
             list(mock_append_spark_prometheus_conf.return_value.keys()) +
             list(mock_append_event_log_conf.return_value.keys()) +