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Add Support for Cache and S3 related metrics in Prometheus endpoint (#8591)

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This PR adds support below metrics

- Cache Hit Count
- Cache Miss Count
- Data served from Cache (in Bytes)
- Bytes received from AWS S3
- Bytes sent to AWS S3
- Number of requests sent to AWS S3

Fixes #8549
This commit is contained in:
Nitish Tiwari
2019-12-06 12:46:06 +05:30
committed by Harshavardhana
parent d2dc964cb5
commit 3df7285c3c
32 changed files with 400 additions and 86 deletions
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18
docs/metrics/prometheus/README.md
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@@ -118,7 +118,6 @@ The list of metrics and its definition are as follows. (NOTE: instance here is o
> 1. Instance here is one MinIO node.
> 2. `s3 requests` exclude internode requests.
- standard go runtime metrics prefixed by `go_`
- process level metrics prefixed with `process_`
- prometheus scrap metrics prefixed with `promhttp_`
@@ -138,6 +137,23 @@ The list of metrics and its definition are as follows. (NOTE: instance here is o
- `minio_version_info`: Current MinIO version with commit-id.
- `s3_ttfb_seconds`: Histogram that holds the latency information of the requests.
Apart from above metrics, MinIO also exposes below mode specific metrics
### Cache specific metrics
MinIO Gateway instances enabled with Disk-Caching expose caching related metrics.
- `cache_data_served`: Total number of bytes served from cache.
- `cache_hits_total`: Total number of cache hits.
- `cache_misses_total`: Total number of cache misses.
### S3 Gateway & Cache specific metrics
MinIO S3 Gateway instance exposes metrics related to Gateway communication with AWS S3.
- `gateway_s3_requests`: Total number of GET & HEAD requests made to AWS S3. This metrics has a label `method` that identifies GET & HEAD Requests.
- `gateway_s3_bytes_sent`: Total number of bytes sent to AWS S3 (in GET & HEAD Requests).
- `gateway_s3_bytes_received`: Total number of bytes received from AWS S3 (in GET & HEAD Requests).
## Migration guide for the new set of metrics