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fix: export prometheus metrics for cache GC triggers (#9815)

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Bonus change to use channel to serialize triggers,
instead of using atomic variables. More efficient
mechanism for synchronization.

Co-authored-by: Nitish Tiwari <nitish@minio.io>
This commit is contained in:
Harshavardhana
2020-06-15 09:05:35 -07:00
committed by GitHub
parent 2073b79633
commit f9aa239973
6 changed files with 133 additions and 59 deletions
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23
docs/metrics/prometheus/README.md
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@@ -110,7 +110,7 @@ These are the new set of metrics which will be in effect after `RELEASE.2019-10-
- Metrics that records the http statistics and latencies are labeled to their respective APIs (putobject,getobject etc).
- Disk usage metrics are distributed and labeled to the respective disk paths.
For more details, please check the `Migration guide for the new set of metrics`.
For more details, please check the `Migration guide for the new set of metrics`.
The list of metrics and its definition are as follows. (NOTE: instance here is one MinIO node)
@@ -178,14 +178,23 @@ All metrics are labeled by `bucket`, each metric is displayed per bucket. `bucke
MinIO Gateway instances enabled with Disk-Caching expose caching related metrics.
| name | description |
|:---------------------|:----------------------------------------|
| `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 |
#### Global cache metrics
| name | description |
|:---------------------|:--------------------------------------------------|
| `cache_hits_total` | Total number of cache hits |
| `cache_misses_total` | Total number of cache misses |
| `cache_data_served` | Total number of bytes served from cache |
### Gateway & Cache specific metrics
#### Per disk cache metrics
| `cache_usage_percent` | Total percentage cache usage |
| `cache_usage_state` | Indicates cache usage is high or low, relative to current cache 'quota' settings |
`cache_usage_state` holds only two states
- '1' indicates high disk usage
- '0' indicates low disk usage
### Gateway specific metrics
MinIO Gateway instance exposes metrics related to Gateway communication with the cloud backend (S3, Azure & GCS Gateway).
`<gateway_type>` changes based on the gateway in use can be 's3', 'gcs' or 'azure'. Other metrics are labeled with `method` that identifies HTTP GET, HEAD, PUT and POST requests to the backend.