Enable graceful HTTP shutdown and document default behavior

Closes #43589

Signed-off-by: Ruchika <ruchika.jha1@ibm.com>
Signed-off-by: Alexander Schwartz <alexander.schwartz@ibm.com>
Co-authored-by: Alexander Schwartz <alexander.schwartz@ibm.com>

docs/documentation/release_notes/topics/26_6_0.adoc

@@ -22,6 +22,20 @@ These properties are shared among the available OpenTelemetry components - logs,
 
 For more details, see the link:{telemetryguide_link}[{telemetryguide_name}] guide.
 
+= Graceful shutdown of HTTP stack
+
+To allow for rolling updates for configuration changes or version updates, a graceful shutdown of {project_name} nodes prevents users seeing error responses when logging in or refreshing their tokens when nodes shut down.
+
+Starting with this version, {project_name} supports a graceful shutdown of the HTTP stack.
+This includes delaying a shutdown after receiving a termination signal, connection draining for HTTP/1.1 and HTTP/2 connections during that period, and a shutdown timeout to finish ongoing requests.
+
+The defaults are a shutdown delay and a shutdown timeout of one second each.
+This should be a good fit for setups where the reverse proxy is using TLS edge termination or re-encrypt, and the reverse proxy is notified about the Keycloak node shutting down at the same time as the Keycloak node.
+This is a common setup for example in Kubernetes environments.
+
+Users should adjust those values depending on their proxy setup.
+See the section https://www.keycloak.org/server/reverseproxy#graceful-http-shutdown[Graceful HTTP shutdown] in the reverse proxy guide for more information.
+
 = Custom request headers for OpenTelemetry
 
 It is now possible to set request headers for exporting telemetry via OpenTelemetry Protocol (OTLP).

docs/documentation/tests/src/test/resources/ignored-links

@@ -42,4 +42,5 @@ https://docs.kantarainitiative.org*
 https://saml.xml.org*
 
 # To be removed once KC 26.6.0 is released
-https://www.keycloak.org/securing-apps/dpop
+https://www.keycloak.org/securing-apps/dpop
+https://www.keycloak.org/server/reverseproxy#graceful-http-shutdown

docs/documentation/upgrading/topics/changes/changes-26_6_0.adoc

@@ -38,6 +38,13 @@ When running the server in dev mode on a platform other than Windows Subsystem F
 This ensures your dev instance won't be accessible from
 other machines. If you want the previous behavior of binding to all interfaces, then explicitly set `http-host` to `0.0.0.0`.
 
+=== Graceful shutdown of HTTP stack
+
+Starting with this version, {project_name} will apply a shutdown delay and a shutdown timeout of one second each to allow a graceful termination.
+
+Users should adjust those values depending on their proxy setup.
+See the section https://www.keycloak.org/server/reverseproxy#graceful-http-shutdown[Graceful HTTP shutdown] in the reverse proxy guide for more information.
+
 === `X-Forwarded-Prefix` Header is now supported
 
 With `proxy-headers` set to `xforwarded`, the server can determine the proxy context path from the `X-Forwarded-Prefix` header.

docs/guides/observability/health.adoc

@@ -40,6 +40,10 @@ These endpoints respond with HTTP status `200 OK` on success or `503 Service Una
 {
     "status": "UP",
     "checks": [
+        {
+            "name": "Graceful Shutdown",
+            "status": "UP"
+        },
         {
             "name": "Keycloak cluster health check",
             "status": "UP"
@@ -120,9 +124,13 @@ The table below shows the available checks.
 |Returns the status of the cluster (network partitions).
 |No
 
+|Graceful shutdown
+|Will start to return "DOWN" once the pre-shutdown phase started.
+|No
+
 |===
 
-For some checks, you'll need to also enable metrics as indicated by the `Requires Metrics` column. To enable metrics
+For some checks, you'll need to also enable metrics as indicated by the *Requires Metrics* column. To enable metrics
 use the `metrics-enabled` option as follows:
 
 <@kc.build parameters="--health-enabled=true --metrics-enabled=true"/>

docs/guides/server/reverseproxy.adoc

@@ -6,7 +6,8 @@
 <@tmpl.guide
 title="Configuring a reverse proxy"
 summary="Configure {project_name} with a reverse proxy, API gateway, or load balancer."
-includedOptions="proxy-* hostname hostname-admin http-relative-path">
+
+includedOptions="proxy-* hostname hostname-admin http-relative-path shutdown-delay shutdown-timeout">
 
 Distributed environments frequently require the use of a reverse proxy. {project_name} offers several options to securely integrate with such environments.
 
@@ -53,7 +54,7 @@ By default {project_name} is exposed through the root context path (`/`). If the
 - Use a simple hostname for the `hostname` option, `xforwarded` for the `proxy-headers` option, and have the proxy set the `X-Forwarded-Prefix` header.
 - Use a full URL for the `hostname` option including the proxy context path, for example using `--hostname=https://my.keycloak.org/auth` if {project_name} is exposed through the reverse proxy on `/auth`.
 - Change the context path of {project_name} itself to match the context path for the reverse proxy using the `http-relative-path` option.
- 
+
 For more details on exposing {project_name} on different hostname or context path incl. Administration REST API and Console, see <@links.server id="hostname"/>.
 
 == Enable sticky sessions
@@ -254,8 +255,6 @@ The NGINX SSL/TLS module does not expose the client certificate chain. {project_
 If you are using this provider, see <@links.server id="keycloak-truststore"/> for how
 to configure a {project_name} Truststore.
 
-</@tmpl.guide>
-
 === Configuring the rfc9440 provider
 
 If you stick to the header names mentioned in RFC 9440, you do not need to configure any additional options after selecting the `rfc9440` provider.
@@ -278,3 +277,134 @@ The default values of the options are as follows:
 
 If your certificate chain is longer than the given default, you must define the option with an appropriate number.
 Otherwise, the provider will discard the request.
+
+[[graceful-http-shutdown]]
+== Graceful HTTP shutdown
+
+When running {project_name} behind a reverse proxy or load balancer, graceful shutdown ensures that in-flight requests complete successfully during server termination, preventing connection errors for clients.
+
+{project_name} enables graceful HTTP shutdown by default with configurable timeouts.
+
+=== Understanding shutdown phases
+
+The shutdown process consists of two phases:
+
+*Pre-shutdown delay*:: During this phase, {project_name} signals to load balancers and proxies that it is preparing to shut down.
+The server's readiness endpoint returns a "not ready" status, allowing the load balancer to stop routing new requests to this instance.
+Existing TLS and HTTP keepalive connections are allowed to drain naturally.
+The server continues to process existing requests.
+
+*Shutdown timeout*:: After the pre-shutdown delay, {project_name} stops accepting new requests and waits for in-flight HTTP requests to complete.
+If requests are still running after the timeout expires, the server shuts down regardless.
+
+=== Default behavior
+
+By default, {project_name} is configured with a 1-second pre-shutdown delay and a 1-second shutdown timeout.
+These defaults work well for most standard deployments where:
+
+* The load balancer reconfigures quickly (within 1 second)
+* Most requests complete within 1 second
+* The reverse proxy uses edge termination or re-encryption (not TLS passthrough)
+
+=== Configuring shutdown timeouts
+
+Advanced users can adjust the shutdown timeouts using CLI options based on their deployment characteristics.
+
+[source,bash]
+----
+bin/kc.sh start --shutdown-delay=<duration> --shutdown-timeout=<duration>
+----
+
+Available options:
+
+`--shutdown-delay`::
+Length of the pre-shutdown phase during which the server prepares for shutdown.
+This period allows for load balancer reconfiguration and draining of TLS/HTTP keepalive connections.
+Default: `1s`
+
+`--shutdown-timeout`::
+The shutdown period waiting for currently running HTTP requests to finish.
+Default: `1s`
+
+Both values accept duration formats: `1s` (seconds), `500ms` (milliseconds), `2m` (minutes), etc.
+
+=== When to adjust shutdown timeouts
+
+Consider adjusting these values based on your deployment configuration with the following example Scenarios:
+
+[%autowidth,cols="2,>1,>1,3a"]
+|===
+|Scenario |Delay |Timeout |Reason
+
+|Load balancer polls readiness probe
+|16s
+|
+|Assumptions:
+
+* 5s poll interval and a load balancer reconfiguring after two successive failed probes.
+* 1s for reconfiguring the proxy.
+* Proxy using TLS re-encrypt or edge termination.
+
+Calculation:
+
+* Allow three poll cycles for the load balancer to detect shutdown and the extra time for the load balancer to perform the reconfiguration:
++
+`shutdown delay = 3 * 5s + 1s`
+
+|TLS passthrough configuration
+|10‑30s
+|
+|Longer delay allows keepalive connections to drain naturally and receive connection close signals.
+
+|Long-running admin API requests
+|
+|10‑30s
+|Admin operations may take longer than typical user requests.
+
+|Test environments / quick restarts
+|0s
+|500ms
+|Minimize shutdown time when graceful draining is not needed.
+
+|Deployment orchestration reconfigures the proxy and drains connections before Pod termination
+|0s
+|
+|No pre-shutdown delay needed if proxy is already reconfigured
+
+|Combined: TLS passthrough plus polled readiness
+|26‑56s
+|
+|Delays add up: time for load balancer detection + connection draining
+
+|===
+
+==== Example configurations
+
+For production with TLS passthrough:
+
+[source,bash]
+----
+<@kc.start parameters="--shutdown-delay=30s --shutdown-timeout=1s"/>
+----
+
+For load balancers that poll readiness:
+
+[source,bash]
+----
+<@kc.start parameters="--shutdown-delay=16s --shutdown-timeout=1s"/>
+----
+
+For test environments:
+
+[source,bash]
+----
+<@kc.start parameters="--shutdown-delay=0s --shutdown-timeout=500ms"/>
+----
+
+[NOTE]
+====
+The shutdown delay affects the minimum time required for a complete server restart.
+In Kubernetes environments, ensure your `terminationGracePeriodSeconds` is longer than the sum of `shutdown-delay` and `shutdown-timeout` to prevent forced termination.
+====
+
+</@tmpl.guide>

quarkus/config-api/src/main/java/org/keycloak/config/HttpOptions.java

@@ -150,4 +150,16 @@ public class HttpOptions {
             .defaultValue(Boolean.FALSE)
             .build();
 
+    public static final Option<String> SHUTDOWN_TIMEOUT = new OptionBuilder<>("shutdown-timeout", String.class)
+            .category(OptionCategory.HTTP)
+            .description("The shutdown period waiting for currently running HTTP requests to finish. " + DURATION_DESCRIPTION)
+            .defaultValue("1s")
+            .build();
+
+    public static final Option<String> SHUTDOWN_DELAY = new OptionBuilder<>("shutdown-delay", String.class)
+            .category(OptionCategory.HTTP)
+            .description("Length of the pre-shutdown phase during which the server prepares for shutdown. " + DURATION_DESCRIPTION +
+                    " This period allows for loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.")
+            .defaultValue("1s")
+            .build();
 }

quarkus/runtime/src/main/java/org/keycloak/quarkus/runtime/configuration/mappers/HttpPropertyMappers.java

@@ -4,12 +4,14 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.time.Duration;
 import java.util.List;
 import java.util.Optional;
 
 import org.keycloak.common.Profile;
 import org.keycloak.common.crypto.FipsMode;
 import org.keycloak.config.HttpOptions;
+import org.keycloak.config.OptionsUtil;
 import org.keycloak.config.SecurityOptions;
 import org.keycloak.quarkus.runtime.Environment;
 import org.keycloak.quarkus.runtime.Messages;
@@ -19,6 +21,7 @@ import org.keycloak.quarkus.runtime.cli.PropertyException;
 import org.keycloak.quarkus.runtime.cli.command.AbstractCommand;
 
 import io.quarkus.runtime.LaunchMode;
+import io.quarkus.runtime.configuration.DurationConverter;
 import io.quarkus.runtime.util.ClassPathUtils;
 import io.quarkus.vertx.http.runtime.options.TlsUtils;
 import io.smallrye.config.ConfigSourceInterceptorContext;
@@ -182,8 +185,19 @@ public final class HttpPropertyMappers implements PropertyMapperGrouping {
                         .to("quarkus.rest.jackson.optimization.enable-reflection-free-serializers")
                         .build(),
                 fromOption(HttpOptions.HTTP_ACCEPT_NON_NORMALIZED_PATHS)
+                        .build(),
+                fromOption(HttpOptions.SHUTDOWN_TIMEOUT)
+                        .to("quarkus.shutdown.timeout")
+                        .paramLabel("timeout")
+                        .validator(HttpPropertyMappers::validateShutdownDuration)
+                        .build(),
+                fromOption(HttpOptions.SHUTDOWN_DELAY)
+                        .to("quarkus.shutdown.delay")
+                        .paramLabel("delay")
+                        .validator(HttpPropertyMappers::validateShutdownDuration)
                         .build()
         );
+
     }
 
     @Override
@@ -242,4 +256,15 @@ public final class HttpPropertyMappers implements PropertyMapperGrouping {
         }
         return value;
     }
+
+    private static void validateShutdownDuration(String value) {
+        try {
+            Duration duration = DurationConverter.parseDuration(value);
+            if (duration == null || duration.isNegative()) {
+                throw new PropertyException("Invalid duration '%s'. Duration must be zero or positive.".formatted(value));
+            }
+        } catch (IllegalArgumentException e) {
+            throw new PropertyException("Invalid duration format '%s'. %s".formatted(value, OptionsUtil.DURATION_DESCRIPTION));
+        }
+    }
 }

quarkus/runtime/src/main/resources/application.properties

@@ -106,6 +106,7 @@ mp.openapi.extensions.smallrye.duplicateOperationIdBehavior=FAIL
 # Disable Error messages from smallrye.openapi
 # related issue: https://github.com/keycloak/keycloak/issues/41871
 quarkus.log.category."io.smallrye.openapi.runtime.scanner.dataobject".level=off
-
 # 3.31.1 appears to have a hibernate bug
-quarkus.log.category."org.hibernate.orm.sql.exec".level=info
+quarkus.log.category."org.hibernate.orm.sql.exec".level=info
+# Enable shutdown delay by default as it is a built-time property, and timeout are then configured at runtime
+quarkus.shutdown.delay-enabled=true

quarkus/tests/integration/src/test/java/org/keycloak/it/cli/dist/HealthDistTest.java

@@ -83,7 +83,7 @@ public class HealthDistTest {
                 .statusCode(200);
         when().get("/health/ready").then()
                 .statusCode(200)
-                .body("checks.size()", equalTo(2));
+                .body("checks.size()", equalTo(3));
         when().get("/lb-check").then()
                 .statusCode(404);
     }

quarkus/tests/integration/src/test/java/org/keycloak/it/cli/dist/HttpDistTest.java

@@ -108,4 +108,18 @@ public class HttpDistTest {
         result.assertExitCode(-1);
         result.assertMessage("ERROR: No trust store password provided");
     }
+
+    @Test
+    @Launch({"start-dev", "--shutdown-delay=1s", "--shutdown-timeout=0s"})
+    public void testShutdownParametersValidValues() {
+        // Test that valid shutdown parameters are accepted (including 0s)
+        when().get("/realms/master").then().statusCode(200);
+    }
+
+    @Test
+    public void testShutdownParametersNegativeValue(KeycloakDistribution dist) {
+        // Test that negative values are rejected
+        CLIResult result = dist.run("start-dev", "--shutdown-delay=-1s");
+        result.assertError("Invalid duration '-1s'. Duration must be zero or positive");
+    }
 }

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testStartDevHelp.approved.txt

@@ -282,6 +282,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log:
 

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testStartDevHelpAll.approved.txt

@@ -361,6 +361,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log:
 

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testStartHelp.approved.txt

@@ -330,6 +330,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log:
 

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testStartHelpAll.approved.txt

@@ -362,6 +362,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log:
 

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testStartOptimizedHelp.approved.txt

@@ -292,6 +292,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log:
 

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testStartOptimizedHelpAll.approved.txt

@@ -324,6 +324,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log:
 

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testUpdateCompatibilityCheckHelp.approved.txt

@@ -329,6 +329,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log:
 

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testUpdateCompatibilityCheckHelpAll.approved.txt

@@ -361,6 +361,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log:
 

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testUpdateCompatibilityMetadataHelp.approved.txt

@@ -327,6 +327,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log:
 

quarkus/tests/integration/src/test/resources/org/keycloak/it/cli/dist/approvals/cli/help/HelpCommandDistTest.testUpdateCompatibilityMetadataHelpAll.approved.txt

@@ -359,6 +359,16 @@ HTTP(S):
                      The type of the trust store file. If not given, the type is automatically
                        detected based on the file extension. If 'fips-mode' is set to 'strict' and
                        no value is set, it defaults to 'BCFKS'.
+--shutdown-delay <delay>
+                     Length of the pre-shutdown phase during which the server prepares for
+                       shutdown. May be an ISO 8601 duration value, an integer number of seconds,
+                       or an integer followed by one of [ms, h, m, s, d]. This period allows for
+                       loadbalancer reconfiguration and draining of TLS/HTTP keepalive connections.
+                       Default: 1s.
+--shutdown-timeout <timeout>
+                     The shutdown period waiting for currently running HTTP requests to finish. May
+                       be an ISO 8601 duration value, an integer number of seconds, or an integer
+                       followed by one of [ms, h, m, s, d]. Default: 1s.
 
 HTTP Access log: