Make option to send internal metrics to carbon server

[Nyoroon]

Make option to send internal metrics (requests, memory etc) to carbon server (like carbonapi, go-carbon and carbon-clickhouse does).

[lomik]

graphite-clickhouse doesn't have metrics. This is only in todo

[Felixoid]

Hey. I'd like to implement it, so the suggestions on what metrics are necessary to implement are very appreciated!

Here's an idea to implement:

• [ ] Counters (increasing metrics)
  • [ ] Requests to service
  • [ ] Metrics requested from upstream
  • [ ] Bytes received from ClickHouse
  • [ ] Metrics --/--
  • [ ] Points --/--
  • [ ] Bytes sent to upstream
  • [ ] Metrics --/--
  • [ ] Points --/--
• [ ] Gauges
  • [ ] Quantiles of ClickHouse latencies on requests / interval
  • [ ] Quantiles of GCH latencies on requests / interval
  • [ ] runtime.memstat

Config template:

[carbon]
server = 'localhost:2003'
send-interval = '1m'
prefix = 'graphite-clickhouse'
quantiles = [0.5, 0.9, 0.99, 0.999, 1]

[msaf1980]

First iteration of metrics in https://github.com/go-graphite/graphite-clickhouse/pull/194

[msaf1980]

First iteration for gch metrics is done in current master. For me is done, i completely remove logstash for collect metrics from logs. If more metrics is needed, you can reopen a issue.