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Gh 3718 add zoned loadbalancer instrumentation (#3720)

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* Add instrumentation for zoned LoadBalancer.

* Add documentation.

* Fix after review.

* Fix after review.
This commit is contained in:
Olga Maciaszek-Sharma
2019-12-19 17:46:50 +01:00
committed by GitHub
parent b51a15c3f2
commit 23659f8aea
8 changed files with 298 additions and 1 deletions
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1
docs/src/main/asciidoc/_configprops.adoc
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@@ -19,6 +19,7 @@
|management.metrics.binders.hystrix.enabled | true | Enables creation of OK Http Client factory beans.
|ribbon.eureka.enabled | true | Enables the use of Eureka with Ribbon.
|spring.cloud.circuitbreaker.hystrix.enabled | true | Enables auto-configuration of the Hystrix Spring Cloud CircuitBreaker API implementation.
|spring.cloud.loadbalancer.eureka.approximate-zone-from-hostname | false | Used to determine whether we should try to get the `zone` value from host name.
|spring.cloud.loadbalancer.ribbon.enabled | true | Causes `RibbonLoadBalancerClient` to be used by default.
|zuul.ribbon-isolation-strategy | |
|zuul.ribbon.eager-load.enabled | false | Enables eager loading of Ribbon clients on startup.

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docs/src/main/asciidoc/spring-cloud-netflix.adoc
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@@ -335,6 +335,18 @@ When a refresh occurs clients will be unregistered from the Eureka server and th
where all instance of a given service are not available. One way to eliminate this from happening is to disable
the ability to refresh Eureka clients. To do this set `eureka.client.refresh.enable=false`.
=== Using Eureka with Spring Cloud LoadBalancer
We offer support for the Spring Cloud LoadBalancer `ZonePreferenceServiceInstanceListSupplier`.
The `zone` value from the Eureka instance metadata (`eureka.instance.metadataMap.zone`) is used for setting the
value of `spring-clod-loadbalancer-zone` property that is used to filter service instances by zone.
If that is missing and if the `spring.cloud.loadbalancer.eureka.approximateZoneFromHostname` flag is set to `true`,
it can use the domain name from the server hostname as a proxy for the zone.
If there is no other source of zone data, then a guess is made, based on the client configuration (as opposed to the instance configuration).
We take `eureka.client.availabilityZones`, which is a map from region name to a list of zones, and pull out the first zone for the instance's own region (that is, the `eureka.client.region`, which defaults to "us-east-1", for compatibility with native Netflix).
[[spring-cloud-eureka-server]]
== Service Discovery: Eureka Server