use_get_metric_data not working with the latest version (0.14.0) of Cloudwatch Exporter

[sandeepnethi]

Hi,

I was trying to evaluate this exporter and found that the experimental flag use_get_metric_data is not working as stated in the instructions and throwing below error when trying to call metrics endpoint.

my exporter config is as below. I have double checked the syntax for this flag from the codebase and I don't see any issues. Please let me know what could be wrong here.

region: us-east-1
metrics:
- aws_namespace: AWS/EC2
  use_get_metric_data: true
  aws_metric_name: CPUUtilization
  aws_dimensions: [InstanceId]
  aws_tag_select:
    resource_type_selection: ec2:instance
    resource_id_dimension: InstanceId

java.lang.NoSuchMethodError: 'java.util.List java.util.stream.Stream.toList()' at io.prometheus.cloudwatch.GetMetricDataDataGetter.buildStatsList(GetMetricDataDataGetter.java:50) at io.prometheus.cloudwatch.GetMetricDataDataGetter.buildMetricDataQueries(GetMetricDataDataGetter.java:61) at io.prometheus.cloudwatch.GetMetricDataDataGetter.buildMetricDataRequests(GetMetricDataDataGetter.java:127) at io.prometheus.cloudwatch.GetMetricDataDataGetter.fetchAllDataPoints(GetMetricDataDataGetter.java:138) at io.prometheus.cloudwatch.GetMetricDataDataGetter.<init>(GetMetricDataDataGetter.java:181) at io.prometheus.cloudwatch.CloudWatchCollector.scrape(CloudWatchCollector.java:586) at io.prometheus.cloudwatch.CloudWatchCollector.collect(CloudWatchCollector.java:690) at io.prometheus.client.Collector.collect(Collector.java:46) at io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.findNextElement(CollectorRegistry.java:197) at io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:212) at io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:152) at io.prometheus.client.exporter.common.TextFormat.write004(TextFormat.java:71) at io.prometheus.client.exporter.common.TextFormat.writeFormat(TextFormat.java:53) at io.prometheus.client.servlet.common.exporter.Exporter.doGet(Exporter.java:75) at io.prometheus.client.exporter.MetricsServlet.doGet(MetricsServlet.java:52)

Thanks,

[gautam-wadhwa-wday]

I hit this issue as well, and on closer inspection, the reason is most likely that you are using a version of the JDK which doesn't have the following method: https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/stream/Stream.html#toList()

The fix for this is to use a JDK which does have the aforementioned method (JDK 16 or later)

[or-shachar]

Thanks for reporting this!

Pretty sure I fixed it in recent commits:

91ce138#diff-2a2be6857e8c6dd575a5dfc1a22cdd8803adb9d5706df9f7ee223f722d2ec81dR52

Maybe we need to release a new version @matthiasr

[matthiasr]

Done!

Note that this has some (medium) CVEs in Netty, I'm already working on another update but waiting for CircleCI to work through a backlog.