Add XDCR Remote Cluster Stats

[marzlarz]

Based on the Couchbase REST API documentation, you can retrieve some metrics regarding the health of your remote data center replication:

https://docs.couchbase.com/server/6.0/rest-api/rest-xdcr-statistics.html

The most important of these being:

wtavg_docs_latency
wtavg_meta_latency

This will allow you to track the replication time between clusters. If this could be added to couchbase-exporter that would be awesome

[metonymic-smokey]

@amalucelli if the XDCR metrics are to be added, we will add to collector/bucket.go and also to the following location, right(after the existing XDCR metrics)?

couchbase-exporter/client/buckets.go

Line 125 in 85b6cee

EpDcpXdcrItemsRemaining []float64 `json:"ep_dcp_xdcr_items_remaining"`

Just wanted to see if I could try to add this feature.
Thanks!

[amalucelli]

@metonymic-smokey feel free to fork and propose a PR if you want, you can also run your own version with your changes if you want, this isn’t something that we will tackle now, sorry.