The following metrics where available after making the Eureka server unavailable twice and thus causing a status change to UNKNOWNand dirying of the InstanceInfo.
# HELP http_client_requests_seconds_max
# TYPE http_client_requests_seconds_max gauge
http_client_requests_seconds_max{client_name="localhost",error="ResourceAccessException",exception="ResourceAccessException",method="GET",outcome="UNKNOWN",status="CLIENT_ERROR",uri="/eureka/apps/delta"} 0.0410048
http_client_requests_seconds_max{client_name="localhost",error="ResourceAccessException",exception="ResourceAccessException",method="PUT",outcome="UNKNOWN",status="CLIENT_ERROR",uri="/eureka/apps/<appName>/<instanceId>?status=UP&lastDirtyTimestamp=1720440338928"} 0.0
http_client_requests_seconds_max{client_name="localhost",error="ResourceAccessException",exception="ResourceAccessException",method="PUT",outcome="UNKNOWN",status="CLIENT_ERROR",uri="/eureka/apps/<appName>/<instanceId>?status=UP&lastDirtyTimestamp=1720441059188"} 0.0409643
http_client_requests_seconds_max{client_name="localhost",error="none",exception="none",method="GET",outcome="SUCCESS",status="200",uri="/eureka/apps/"} 0.0054987
http_client_requests_seconds_max{client_name="localhost",error="none",exception="none",method="GET",outcome="SUCCESS",status="200",uri="/eureka/apps/delta"} 0.0476062
http_client_requests_seconds_max{client_name="localhost",error="none",exception="none",method="POST",outcome="SUCCESS",status="204",uri="/eureka/apps/<appName>"} 0.0078605
http_client_requests_seconds_max{client_name="localhost",error="none",exception="none",method="PUT",outcome="CLIENT_ERROR",status="404",uri="/eureka/apps/<appName>/<instanceId>?status=UP&lastDirtyTimestamp=1720440338928"} 0.0
http_client_requests_seconds_max{client_name="localhost",error="none",exception="none",method="PUT",outcome="CLIENT_ERROR",status="404",uri="/eureka/apps/<appName>/<instanceId>?status=UP&lastDirtyTimestamp=1720441059188"} 0.0194635
http_client_requests_seconds_max{client_name="localhost",error="none",exception="none",method="PUT",outcome="SUCCESS",status="200",uri="/eureka/apps/<appName>/<instanceId>?status=DOWN&lastDirtyTimestamp=1720440308847"} 0.0
http_client_requests_seconds_max{client_name="localhost",error="none",exception="none",method="PUT",outcome="SUCCESS",status="200",uri="/eureka/apps/<appName>/<instanceId>?status=UP&lastDirtyTimestamp=1720440338928"} 0.0
http_client_requests_seconds_max{client_name="localhost",error="none",exception="none",method="PUT",outcome="SUCCESS",status="200",uri="/eureka/apps/<appName>/<instanceId>?status=UP&lastDirtyTimestamp=1720441059188"} 0.0066927
http_client_requests_seconds_max{client_name="localhost",error="none",exception="none",method="PUT",outcome="SUCCESS",status="200",uri="/eureka/apps/<appName>/<instanceId>?status=UP&lastDirtyTimestamp=1720442649723"} 0.0058572
After observability support was added to
RestTemplateEurekaHttpClientin #4255 by using theRestTemplateBuildermetrics are being generated for Eureka client requests.The
ClientRequestObservationConventionadds the URI template of the requests as a low cardinality observability/metric key-value/tag.The current implementations of
EurekaHttpClientbased on RestTemplate and WebClient assemble the full URL of the requsts and pass it to the client implementation. This causes a high number of values for the URI tag in the metrics, especially if thelastDirtyTimestampchanges often (due to e.g. flaky health of some component). By default only 100 values are allowed for the URI tag, additional values would be dropped and the metrics using these values are ignored.Could be mitigated by passing at least the
lastDirtyTimestampas auriVariableto the RestTemplate calls.Version: spring-cloud-netflix-eureka-client 4.1.2
Sample of generated (prometheus) metrics
The following metrics where available after making the Eureka server unavailable twice and thus causing a status change to
UNKNOWNand dirying of the InstanceInfo.