* Stop deleting counter metrics during bucket TTL cleanup
Counter metrics (traffic bytes, request counts, object counts) are
monotonically increasing by design. Deleting them after 10 minutes of
bucket inactivity causes them to vanish from /metrics output and reset
to zero when traffic resumes, breaking Prometheus rate()/increase()
queries and making historical traffic reporting impossible.
Only delete gauges and histograms in the TTL cleanup loop, as these
represent current state and are safely re-populated on next activity.
Fixes https://github.com/seaweedfs/seaweedfs/issues/8521
* Clean up all bucket metrics on bucket deletion
Add DeleteBucketMetrics() to delete all metrics (including counters)
for a bucket when it is explicitly deleted. This prevents unbounded
label cardinality from accumulating for buckets that no longer exist.
Called from DeleteBucketHandler after successful bucket deletion.
* Reduce mutex scope in bucket metrics TTL sweep
Collect expired bucket names under the lock, then release before
calling DeletePartialMatch on Prometheus metrics. This prevents
RecordBucketActiveTime from blocking during the expensive cleanup.
see https://blog.aqwari.net/xml-schema-go/
1. go get aqwari.net/xml/cmd/xsdgen
2. Add EncodingType element for ListBucketResult in AmazonS3.xsd
3. xsdgen -o s3api_xsd_generated.go -pkg s3api AmazonS3.xsd
4. Remove empty Grantee struct in s3api_xsd_generated.go
5. Remove xmlns: sed s'/http:\/\/s3.amazonaws.com\/doc\/2006-03-01\/\ //' s3api_xsd_generated.go
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