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metric: add KMS-related metrics (#15258)

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This commit adds a minimal set of KMS-related metrics:
```
 # HELP minio_cluster_kms_online Reports whether the KMS is online (1) or offline (0)
 # TYPE minio_cluster_kms_online gauge
 minio_cluster_kms_online{server="127.0.0.1:9000"} 1
 # HELP minio_cluster_kms_request_error Number of KMS requests that failed with a well-defined error
 # TYPE minio_cluster_kms_request_error counter
 minio_cluster_kms_request_error{server="127.0.0.1:9000"} 16790
 # HELP minio_cluster_kms_request_success Number of KMS requests that succeeded
 # TYPE minio_cluster_kms_request_success counter
 minio_cluster_kms_request_success{server="127.0.0.1:9000"} 348031
```

Currently, we report whether the KMS is available and how many requests
succeeded/failed. However, KES exposes much more metrics that can be
exposed if necessary. See: https://pkg.go.dev/github.com/minio/kes#Metric

Signed-off-by: Andreas Auernhammer <hi@aead.dev>
This commit is contained in:
Andreas Auernhammer
2022-07-11 18:17:28 +02:00
committed by GitHub
parent b49fc33cb3
commit f800cee4fa
6 changed files with 130 additions and 6 deletions
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4
internal/kms/kms.go
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@@ -23,6 +23,7 @@ import (
"encoding/json"
jsoniter "github.com/json-iterator/go"
"github.com/minio/kes"
)
// KMS is the generic interface that abstracts over
@@ -31,6 +32,9 @@ type KMS interface {
// Stat returns the current KMS status.
Stat() (Status, error)
// Metrics returns a KMS metric snapshot.
Metrics(ctx context.Context) (kes.Metric, error)
// CreateKey creates a new key at the KMS with the given key ID.
CreateKey(keyID string) error