fix: rename audit log docs and datastructure

cmd/erasure-sets.go

@@ -455,9 +455,9 @@ func (s *erasureSets) cleanupStaleUploads(ctx context.Context, cleanupInterval,
 const objectErasureMapKey = "objectErasureMap"
 
 type auditObjectOp struct {
-	Pool           int      `json:"pool"`
+	Pool  int      `json:"poolId"`
-	Set            int      `json:"set"`
+	Set   int      `json:"setId"`
-	BackendServers []string `json:"backendServers"`
+	Disks []string `json:"disks"`
 }
 
 func auditObjectErasureSet(ctx context.Context, object string, set *erasureObjects, poolNum int) {
@@ -470,7 +470,7 @@ func auditObjectErasureSet(ctx context.Context, object string, set *erasureObjec
 	op := auditObjectOp{
 		Pool:  poolNum + 1,
 		Set:   set.setNumber + 1,
-		BackendServers: set.getEndpoints(),
+		Disks: set.getEndpoints(),
 	}
 
 	var objectErasureSetTag map[string]auditObjectOp

cmd/logger/message/audit/entry.go

@@ -68,7 +68,9 @@ func ToEntry(w http.ResponseWriter, r *http.Request, reqClaims map[string]interf
 	for k, v := range wh {
 		respHeader[k] = strings.Join(v, ",")
 	}
-	respHeader[xhttp.ETag] = strings.Trim(respHeader[xhttp.ETag], `"`)
+	if etag := respHeader[xhttp.ETag]; etag != "" {
+		respHeader[xhttp.ETag] = strings.Trim(etag, `"`)
+	}
 
 	entry := Entry{
 		Version:      Version,

docs/logging/README.md

@@ -60,10 +60,10 @@ Setting this environment variable automatically enables audit logging to the HTT
 
 NOTE:
 - `timeToFirstByte` and `timeToResponse` will be expressed in Nanoseconds.
-- In the case of the erasure setup `tags.objectErasureMap` provides
+- Additionally in the case of the erasure coded setup `tags.objectErasureMap` provides per object details about
-   - Pool number
+   - Pool number the object operation was performed on.
-   - Set number
+   - Set number the object operation was performed on.
-   - The list of disks belonging to the set
+   - The list of disks participating in this operation belong to the set.
 
 ```json
 {
@@ -103,13 +103,14 @@ NOTE:
   },
   "tags": {
     "objectErasureMap": {
-      "pool": 1,
+      "object": {
-      "set": 10,
+        "poolId": 1,
-      "path/to/object": [
+        "setId": 10,
-        "http://minio.example.com/mnt/zone1/disk1",
+        "disks": [
-        "http://minio.example.com/mnt/zone1/disk2",
+          "http://server01/mnt/pool1/disk01",
-        "http://minio.example.com/mnt/zone1/disk3",
+          "http://server02/mnt/pool1/disk02",
-        "http://minio.example.com/mnt/zone1/disk4"
+          "http://server03/mnt/pool1/disk03",
+          "http://server04/mnt/pool1/disk04"
         ]
      }
   }