In our environment, we're using Collectd 4.10.1 (I know ... old as dirt, but its a requirement of RightScale) and we are trying to leverage the curl_json plugin to pull metrics from our ElasticSearch cluster. We have the metrics coming in properly from http://localhost:9200/_cluster/stats and http://localhost:9200/_cluster/health.
What we can't get working though are any metrics from http://localhost:9200/_nodes/_local/stats. No matter how many or few metrics I define, and no matter whether I use 'nodes/*/...' or 'nodes//...', I cannot seem to get any data from this endpoint.
Here is our entire collectd elasticsearch.conf file, and a real copy of the raw node stats json output:
Any ideas on what might be going on? I can't seem to get any debug logs either, and unfortunately the collectd-dbg package for 4.10.1 is not available it seems like, so we're really hamstrung here.
I have verified that ..
- Collectd is indeed making the curl call to ElasticSearch and the response is coming back properly (via strace, and tcpdump)
- Replacing '*' with 'HYUqTMnfSgmvd87_o3UPLw' (the node id) in the config file does not help
- Dropping all the way down to a single metric (jvm/mem/heap_used_in_bytes) does not help
Can anyone help here?