Common application properties

Appendix A: Common application properties

Various properties can be specified inside your application.properties file, inside your application.yml file, or as command line switches. This appendix provides a list of common Spring Cloud Commons properties and references to the underlying classes that consume them.

Property contributions can come from additional jar files on your classpath, so you should not consider this an exhaustive list. Also, you can define your own properties.

Name Default Description

Name	Default	Description
spring.cloud.compatibility-verifier.compatible-boot-versions		Default accepted versions for the Spring Boot dependency. You can set {@code x} for the patch version if you don’t want to specify a concrete value. Example: {@code 3.4.x}
spring.cloud.compatibility-verifier.enabled	`false`	Enables creation of Spring Cloud compatibility verification.
spring.cloud.config.allow-override	`true`	Flag to indicate that {@link #isOverrideSystemProperties() systemPropertiesOverride} can be used. Set to false to prevent users from changing the default accidentally. Default true.
spring.cloud.config.initialize-on-context-refresh	`false`	Flag to initialize bootstrap configuration on context refresh event. Default false.
spring.cloud.config.override-none	`false`	Flag to indicate that when {@link #setAllowOverride(boolean) allowOverride} is true, external properties should take lowest priority and should not override any existing property sources (including local config files). Default false.
spring.cloud.config.override-system-properties	`true`	Flag to indicate that the external properties should override system properties. Default true.
spring.cloud.decrypt-environment-post-processor.enabled	`true`	Enable the DecryptEnvironmentPostProcessor.
spring.cloud.discovery.client.composite-indicator.enabled	`true`	Enables discovery client composite health indicator.
spring.cloud.discovery.client.health-indicator.enabled	`true`
spring.cloud.discovery.client.health-indicator.include-description	`false`
spring.cloud.discovery.client.health-indicator.use-services-query	`true`	Whether or not the indicator should use {@link DiscoveryClient#getServices} to check its health. When set to {@code false} the indicator instead uses the lighter {@link DiscoveryClient#probe()}. This can be helpful in large deployments where the number of services returned makes the operation unnecessarily heavy.
spring.cloud.discovery.client.simple.instances
spring.cloud.discovery.client.simple.local.host
spring.cloud.discovery.client.simple.local.instance-id
spring.cloud.discovery.client.simple.local.metadata
spring.cloud.discovery.client.simple.local.port	`0`
spring.cloud.discovery.client.simple.local.secure	`false`
spring.cloud.discovery.client.simple.local.service-id
spring.cloud.discovery.client.simple.local.uri
spring.cloud.discovery.client.simple.order
spring.cloud.discovery.enabled	`true`	Enables discovery client health indicators.
spring.cloud.features.enabled	`true`	Enables the features endpoint.
spring.cloud.httpclientfactories.apache.enabled	`true`	Enables creation of Apache Http Client factory beans.
spring.cloud.httpclientfactories.ok.enabled	`true`	Enables creation of OK Http Client factory beans.
spring.cloud.hypermedia.refresh.fixed-delay	`5000`
spring.cloud.hypermedia.refresh.initial-delay	`10000`
spring.cloud.inetutils.default-hostname	`localhost`	The default hostname. Used in case of errors.
spring.cloud.inetutils.default-ip-address	`127.0.0.1`	The default IP address. Used in case of errors.
spring.cloud.inetutils.ignored-interfaces		List of Java regular expressions for network interfaces that will be ignored.
spring.cloud.inetutils.preferred-networks		List of Java regular expressions for network addresses that will be preferred.
spring.cloud.inetutils.timeout-seconds	`1`	Timeout, in seconds, for calculating hostname.
spring.cloud.inetutils.use-only-site-local-interfaces	`false`	Whether to use only interfaces with site local addresses. See {@link InetAddress#isSiteLocalAddress()} for more details.
spring.cloud.loadbalancer.cache.caffeine.spec		The spec to use to create caches. See CaffeineSpec for more details on the spec format.
spring.cloud.loadbalancer.cache.capacity	`256`	Initial cache capacity expressed as int.
spring.cloud.loadbalancer.cache.enabled	`true`	Enables Spring Cloud LoadBalancer caching mechanism.
spring.cloud.loadbalancer.cache.ttl	`35s`	Time To Live - time counted from writing of the record, after which cache entries are expired, expressed as a {@link Duration}. The property {@link String} has to be in keeping with the appropriate syntax as specified in Spring Boot <code>StringToDurationConverter</code>. @see <a href= "https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/StringToDurationConverter.java">StringToDurationConverter.java</a>
spring.cloud.loadbalancer.call-get-with-request-on-delegates	`false`	If this flag is set to {@code true}, {@code ServiceInstanceListSupplier#get(Request request)} method will be implemented to call {@code delegate.get(request)} in classes assignable from {@code DelegatingServiceInstanceListSupplier} that don’t already implement that method, with the exclusion of {@code CachingServiceInstanceListSupplier} and {@code HealthCheckServiceInstanceListSupplier}, which should be placed in the instance supplier hierarchy directly after the supplier performing instance retrieval over the network, before any request-based filtering is done. Note: in 4.1, this behaviour will become the default
spring.cloud.loadbalancer.clients
spring.cloud.loadbalancer.configurations	`default`	Enables a predefined LoadBalancer configuration.
spring.cloud.loadbalancer.eager-load.clients		Names of the clients.
spring.cloud.loadbalancer.enabled	`true`	Enables Spring Cloud LoadBalancer.
spring.cloud.loadbalancer.health-check.initial-delay	`0`	Initial delay value for the HealthCheck scheduler.
spring.cloud.loadbalancer.health-check.interval	`25s`	Interval for rerunning the HealthCheck scheduler.
spring.cloud.loadbalancer.health-check.interval	`25s`	Interval for rerunning the HealthCheck scheduler.
spring.cloud.loadbalancer.health-check.path		Path at which the health-check request should be made. Can be set up per `serviceId`. A `default` value can be set up as well. If none is set up, `/actuator/health` will be used.
spring.cloud.loadbalancer.health-check.port		Path at which the health-check request should be made. If none is set, the port under which the requested service is available at the service instance.
spring.cloud.loadbalancer.health-check.refetch-instances	`false`	Indicates whether the instances should be refetched by the `HealthCheckServiceInstanceListSupplier`. This can be used if the instances can be updated and the underlying delegate does not provide an ongoing flux.
spring.cloud.loadbalancer.health-check.refetch-instances-interval	`25s`	Interval for refetching available service instances.
spring.cloud.loadbalancer.health-check.repeat-health-check	`true`	Indicates whether health checks should keep repeating. It might be useful to set it to `false` if periodically refetching the instances, as every refetch will also trigger a healthcheck.
spring.cloud.loadbalancer.health-check.update-results-list	`true`	Indicates whether the {@code healthCheckFlux} should emit on each alive {@link ServiceInstance} that has been retrieved. If set to {@code false}, the entire alive instances sequence is first collected into a list and only then emitted.
spring.cloud.loadbalancer.hint		Allows setting the value of <code>hint</code> that is passed on to the LoadBalancer request and can subsequently be used in {@link ReactiveLoadBalancer} implementations.
spring.cloud.loadbalancer.hint-header-name	`X-SC-LB-Hint`	Allows setting the name of the header used for passing the hint for hint-based service instance filtering.
spring.cloud.loadbalancer.retry.avoid-previous-instance	`true`	Enables wrapping ServiceInstanceListSupplier beans with `RetryAwareServiceInstanceListSupplier` if Spring-Retry is in the classpath.
spring.cloud.loadbalancer.retry.backoff.enabled	`false`	Indicates whether Reactor Retry backoffs should be applied.
spring.cloud.loadbalancer.retry.backoff.jitter	`0.5`	Used to set `RetryBackoffSpec.jitter`.
spring.cloud.loadbalancer.retry.backoff.max-backoff	`Long.MAX ms`	Used to set `RetryBackoffSpec.maxBackoff`.
spring.cloud.loadbalancer.retry.backoff.min-backoff	`5 ms`	Used to set `RetryBackoffSpec#minBackoff`.
spring.cloud.loadbalancer.retry.enabled	`true`	Enables LoadBalancer retries.
spring.cloud.loadbalancer.retry.max-retries-on-next-service-instance	`1`	Number of retries to be executed on the next `ServiceInstance`. A `ServiceInstance` is chosen before each retry call.
spring.cloud.loadbalancer.retry.max-retries-on-same-service-instance	`0`	Number of retries to be executed on the same `ServiceInstance`.
spring.cloud.loadbalancer.retry.retry-on-all-exceptions	`false`	Indicates retries should be attempted for all exceptions, not only those specified in `retryableExceptions`.
spring.cloud.loadbalancer.retry.retry-on-all-operations	`false`	Indicates retries should be attempted on operations other than `HttpMethod.GET`.
spring.cloud.loadbalancer.retry.retryable-exceptions	`{}`	A `Set` of `Throwable` classes that should trigger a retry.
spring.cloud.loadbalancer.retry.retryable-status-codes	`{}`	A `Set` of status codes that should trigger a retry.
spring.cloud.loadbalancer.service-discovery.timeout		String representation of Duration of the timeout for calls to service discovery.
spring.cloud.loadbalancer.stats.micrometer.enabled	`false`	Enables Spring Cloud LoadBalancer Micrometer stats.
spring.cloud.loadbalancer.sticky-session.add-service-instance-cookie	`false`	Indicates whether a cookie with the newly selected instance should be added by LoadBalancer.
spring.cloud.loadbalancer.sticky-session.instance-id-cookie-name	`sc-lb-instance-id`	The name of the cookie holding the preferred instance id.
spring.cloud.loadbalancer.x-forwarded.enabled	`false`	To Enable X-Forwarded Headers.
spring.cloud.loadbalancer.zone		Spring Cloud LoadBalancer zone.
spring.cloud.refresh.additional-property-sources-to-retain		Additional property sources to retain during a refresh. Typically only system property sources are retained. This property allows property sources, such as property sources created by EnvironmentPostProcessors to be retained as well.
spring.cloud.refresh.enabled	`true`	Enables autoconfiguration for the refresh scope and associated features.
spring.cloud.refresh.extra-refreshable	`true`	Additional class names for beans to post process into refresh scope.
spring.cloud.refresh.never-refreshable	`true`	Comma separated list of class names for beans to never be refreshed or rebound.
spring.cloud.service-registry.auto-registration.enabled	`true`	Whether service auto-registration is enabled. Defaults to true.
spring.cloud.service-registry.auto-registration.fail-fast	`false`	Whether startup fails if there is no AutoServiceRegistration. Defaults to false.
spring.cloud.service-registry.auto-registration.register-management	`true`	Whether to register the management as a service. Defaults to true.
spring.cloud.util.enabled	`true`	Enables creation of Spring Cloud utility beans.

spring.cloud.compatibility-verifier.compatible-boot-versions

Default accepted versions for the Spring Boot dependency. You can set {@code x} for the patch version if you don’t want to specify a concrete value. Example: {@code 3.4.x}

spring.cloud.compatibility-verifier.enabled

false

Enables creation of Spring Cloud compatibility verification.

spring.cloud.config.allow-override

true

Flag to indicate that {@link #isOverrideSystemProperties() systemPropertiesOverride} can be used. Set to false to prevent users from changing the default accidentally. Default true.

spring.cloud.config.initialize-on-context-refresh

false

Flag to initialize bootstrap configuration on context refresh event. Default false.

spring.cloud.config.override-none

false

Flag to indicate that when {@link #setAllowOverride(boolean) allowOverride} is true, external properties should take lowest priority and should not override any existing property sources (including local config files). Default false.

spring.cloud.config.override-system-properties

true

Flag to indicate that the external properties should override system properties. Default true.

spring.cloud.decrypt-environment-post-processor.enabled

true

Enable the DecryptEnvironmentPostProcessor.

spring.cloud.discovery.client.composite-indicator.enabled

true

Enables discovery client composite health indicator.

spring.cloud.discovery.client.health-indicator.enabled

true

spring.cloud.discovery.client.health-indicator.include-description

false

spring.cloud.discovery.client.health-indicator.use-services-query

true

Whether or not the indicator should use {@link DiscoveryClient#getServices} to check its health. When set to {@code false} the indicator instead uses the lighter {@link DiscoveryClient#probe()}. This can be helpful in large deployments where the number of services returned makes the operation unnecessarily heavy.

spring.cloud.discovery.client.simple.instances

spring.cloud.discovery.client.simple.local.host

spring.cloud.discovery.client.simple.local.instance-id

spring.cloud.discovery.client.simple.local.metadata

spring.cloud.discovery.client.simple.local.port

0

spring.cloud.discovery.client.simple.local.secure

false

spring.cloud.discovery.client.simple.local.service-id

spring.cloud.discovery.client.simple.local.uri

spring.cloud.discovery.client.simple.order

spring.cloud.discovery.enabled

true

Enables discovery client health indicators.

spring.cloud.features.enabled

true

Enables the features endpoint.

spring.cloud.httpclientfactories.apache.enabled

true

Enables creation of Apache Http Client factory beans.

spring.cloud.httpclientfactories.ok.enabled

true

Enables creation of OK Http Client factory beans.

spring.cloud.hypermedia.refresh.fixed-delay

5000

spring.cloud.hypermedia.refresh.initial-delay

10000

spring.cloud.inetutils.default-hostname

localhost

The default hostname. Used in case of errors.

spring.cloud.inetutils.default-ip-address

127.0.0.1

The default IP address. Used in case of errors.

spring.cloud.inetutils.ignored-interfaces

List of Java regular expressions for network interfaces that will be ignored.

spring.cloud.inetutils.preferred-networks

List of Java regular expressions for network addresses that will be preferred.

spring.cloud.inetutils.timeout-seconds

1

Timeout, in seconds, for calculating hostname.

spring.cloud.inetutils.use-only-site-local-interfaces

false

Whether to use only interfaces with site local addresses. See {@link InetAddress#isSiteLocalAddress()} for more details.

spring.cloud.loadbalancer.cache.caffeine.spec

The spec to use to create caches. See CaffeineSpec for more details on the spec format.

spring.cloud.loadbalancer.cache.capacity

256

Initial cache capacity expressed as int.

spring.cloud.loadbalancer.cache.enabled

true

Enables Spring Cloud LoadBalancer caching mechanism.

spring.cloud.loadbalancer.cache.ttl

35s

Time To Live - time counted from writing of the record, after which cache entries are expired, expressed as a {@link Duration}. The property {@link String} has to be in keeping with the appropriate syntax as specified in Spring Boot <code>StringToDurationConverter</code>. @see <a href= "https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/StringToDurationConverter.java">StringToDurationConverter.java</a>

spring.cloud.loadbalancer.call-get-with-request-on-delegates

false

If this flag is set to {@code true}, {@code ServiceInstanceListSupplier#get(Request request)} method will be implemented to call {@code delegate.get(request)} in classes assignable from {@code DelegatingServiceInstanceListSupplier} that don’t already implement that method, with the exclusion of {@code CachingServiceInstanceListSupplier} and {@code HealthCheckServiceInstanceListSupplier}, which should be placed in the instance supplier hierarchy directly after the supplier performing instance retrieval over the network, before any request-based filtering is done. Note: in 4.1, this behaviour will become the default

spring.cloud.loadbalancer.clients

spring.cloud.loadbalancer.configurations

default

Enables a predefined LoadBalancer configuration.

spring.cloud.loadbalancer.eager-load.clients

Names of the clients.

spring.cloud.loadbalancer.enabled

true

Enables Spring Cloud LoadBalancer.

spring.cloud.loadbalancer.health-check.initial-delay

0

Initial delay value for the HealthCheck scheduler.

spring.cloud.loadbalancer.health-check.interval

25s

Interval for rerunning the HealthCheck scheduler.

spring.cloud.loadbalancer.health-check.interval

25s

Interval for rerunning the HealthCheck scheduler.

spring.cloud.loadbalancer.health-check.path

Path at which the health-check request should be made. Can be set up per serviceId. A default value can be set up as well. If none is set up, /actuator/health will be used.

spring.cloud.loadbalancer.health-check.port

Path at which the health-check request should be made. If none is set, the port under which the requested service is available at the service instance.

spring.cloud.loadbalancer.health-check.refetch-instances

false

Indicates whether the instances should be refetched by the HealthCheckServiceInstanceListSupplier. This can be used if the instances can be updated and the underlying delegate does not provide an ongoing flux.

spring.cloud.loadbalancer.health-check.refetch-instances-interval

25s

Interval for refetching available service instances.

spring.cloud.loadbalancer.health-check.repeat-health-check

true

Indicates whether health checks should keep repeating. It might be useful to set it to false if periodically refetching the instances, as every refetch will also trigger a healthcheck.

spring.cloud.loadbalancer.health-check.update-results-list

true

Indicates whether the {@code healthCheckFlux} should emit on each alive {@link ServiceInstance} that has been retrieved. If set to {@code false}, the entire alive instances sequence is first collected into a list and only then emitted.

spring.cloud.loadbalancer.hint

Allows setting the value of <code>hint</code> that is passed on to the LoadBalancer request and can subsequently be used in {@link ReactiveLoadBalancer} implementations.

spring.cloud.loadbalancer.hint-header-name

X-SC-LB-Hint

Allows setting the name of the header used for passing the hint for hint-based service instance filtering.

spring.cloud.loadbalancer.retry.avoid-previous-instance

true

Enables wrapping ServiceInstanceListSupplier beans with RetryAwareServiceInstanceListSupplier if Spring-Retry is in the classpath.

spring.cloud.loadbalancer.retry.backoff.enabled

false

Indicates whether Reactor Retry backoffs should be applied.

spring.cloud.loadbalancer.retry.backoff.jitter

0.5

Used to set RetryBackoffSpec.jitter.

spring.cloud.loadbalancer.retry.backoff.max-backoff

Long.MAX ms

Used to set RetryBackoffSpec.maxBackoff.

spring.cloud.loadbalancer.retry.backoff.min-backoff

5 ms

Used to set RetryBackoffSpec#minBackoff.

spring.cloud.loadbalancer.retry.enabled

true

Enables LoadBalancer retries.

spring.cloud.loadbalancer.retry.max-retries-on-next-service-instance

1

Number of retries to be executed on the next ServiceInstance. A ServiceInstance is chosen before each retry call.

spring.cloud.loadbalancer.retry.max-retries-on-same-service-instance

0

Number of retries to be executed on the same ServiceInstance.

spring.cloud.loadbalancer.retry.retry-on-all-exceptions

false

Indicates retries should be attempted for all exceptions, not only those specified in retryableExceptions.

spring.cloud.loadbalancer.retry.retry-on-all-operations

false

Indicates retries should be attempted on operations other than HttpMethod.GET.

spring.cloud.loadbalancer.retry.retryable-exceptions

{}

A Set of Throwable classes that should trigger a retry.

spring.cloud.loadbalancer.retry.retryable-status-codes

{}

A Set of status codes that should trigger a retry.

spring.cloud.loadbalancer.service-discovery.timeout

String representation of Duration of the timeout for calls to service discovery.

spring.cloud.loadbalancer.stats.micrometer.enabled

false

Enables Spring Cloud LoadBalancer Micrometer stats.

spring.cloud.loadbalancer.sticky-session.add-service-instance-cookie

false

Indicates whether a cookie with the newly selected instance should be added by LoadBalancer.

spring.cloud.loadbalancer.sticky-session.instance-id-cookie-name

sc-lb-instance-id

The name of the cookie holding the preferred instance id.

spring.cloud.loadbalancer.x-forwarded.enabled

false

To Enable X-Forwarded Headers.

spring.cloud.loadbalancer.zone

Spring Cloud LoadBalancer zone.

spring.cloud.refresh.additional-property-sources-to-retain

Additional property sources to retain during a refresh. Typically only system property sources are retained. This property allows property sources, such as property sources created by EnvironmentPostProcessors to be retained as well.

spring.cloud.refresh.enabled

true

Enables autoconfiguration for the refresh scope and associated features.

spring.cloud.refresh.extra-refreshable

true

Additional class names for beans to post process into refresh scope.

spring.cloud.refresh.never-refreshable

true

Comma separated list of class names for beans to never be refreshed or rebound.

spring.cloud.service-registry.auto-registration.enabled

true

Whether service auto-registration is enabled. Defaults to true.

spring.cloud.service-registry.auto-registration.fail-fast

false

Whether startup fails if there is no AutoServiceRegistration. Defaults to false.

spring.cloud.service-registry.auto-registration.register-management

true

Whether to register the management as a service. Defaults to true.

spring.cloud.util.enabled

true

Enables creation of Spring Cloud utility beans.

1. Observability metadata

1.1. Observability - Metrics

Below you can find a list of all metrics declared by this project.

1.1.1. Circuit Breaker Function Observation

Observation created when we wrap a Function passed to the CircuitBreaker as fallback.

Metric name spring.cloud.circuitbreaker (defined by convention class org.springframework.cloud.client.circuitbreaker.observation.DefaultCircuitBreakerObservationConvention). Type timer.

Metric name spring.cloud.circuitbreaker.active (defined by convention class org.springframework.cloud.client.circuitbreaker.observation.DefaultCircuitBreakerObservationConvention). Type long task timer.

KeyValues that are added after starting the Observation might be missing from the *.active metrics.

Micrometer internally uses nanoseconds for the baseunit. However, each backend determines the actual baseunit. (i.e. Prometheus uses seconds)

Fully qualified name of the enclosing class org.springframework.cloud.client.circuitbreaker.observation.CircuitBreakerObservationDocumentation.

All tags must be prefixed with spring.cloud.circuitbreaker prefix!

Table 1. Low cardinality Keys
Name	Description
`spring.cloud.circuitbreaker.type` (required)	Defines the type of wrapped lambda.

1.1.2. Circuit Breaker Supplier Observation

Observation created when we wrap a Supplier passed to the CircuitBreaker.

Metric name spring.cloud.circuitbreaker (defined by convention class org.springframework.cloud.client.circuitbreaker.observation.DefaultCircuitBreakerObservationConvention). Type timer.

KeyValues that are added after starting the Observation might be missing from the *.active metrics.

Micrometer internally uses nanoseconds for the baseunit. However, each backend determines the actual baseunit. (i.e. Prometheus uses seconds)

Fully qualified name of the enclosing class org.springframework.cloud.client.circuitbreaker.observation.CircuitBreakerObservationDocumentation.

All tags must be prefixed with spring.cloud.circuitbreaker prefix!

Table 2. Low cardinality Keys
Name	Description
`spring.cloud.circuitbreaker.type` (required)	Defines the type of wrapped lambda.

1.2. Observability - Spans

Below you can find a list of all spans declared by this project.

1.2.1. Circuit Breaker Function Observation Span

Observation created when we wrap a Function passed to the CircuitBreaker as fallback.

Span name spring.cloud.circuitbreaker (defined by convention class org.springframework.cloud.client.circuitbreaker.observation.DefaultCircuitBreakerObservationConvention).

Fully qualified name of the enclosing class org.springframework.cloud.client.circuitbreaker.observation.CircuitBreakerObservationDocumentation.

All tags must be prefixed with spring.cloud.circuitbreaker prefix!

Table 3. Tag Keys
Name	Description
`spring.cloud.circuitbreaker.type` (required)	Defines the type of wrapped lambda.

1.2.2. Circuit Breaker Supplier Observation Span

Observation created when we wrap a Supplier passed to the CircuitBreaker.

Span name spring.cloud.circuitbreaker (defined by convention class org.springframework.cloud.client.circuitbreaker.observation.DefaultCircuitBreakerObservationConvention).

Fully qualified name of the enclosing class org.springframework.cloud.client.circuitbreaker.observation.CircuitBreakerObservationDocumentation.

All tags must be prefixed with spring.cloud.circuitbreaker prefix!

Table 4. Tag Keys
Name	Description
`spring.cloud.circuitbreaker.type` (required)	Defines the type of wrapped lambda.