Use +Inf label additionally for Histogram metrics

[shtripat]

Community Contribution License

All community contributions in this pull request are licensed to the project maintainers
under the terms of the Apache 2 license.
By creating this pull request I represent that I have the right to license the
contributions to the project maintainers under the Apache 2 license.

Description

Motivation and Context

Issue: #18790

How to test this PR?

mc admin prometheus metrics ALIAS | grep ttfb would show additional rows with label +Inf as below

# HELP minio_s3_requests_ttfb_seconds_distribution Distribution of time to first byte across API calls
# TYPE minio_s3_requests_ttfb_seconds_distribution gauge
minio_s3_requests_ttfb_seconds_distribution{api="getbucketlocation",le="+Inf",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketlocation",le="0.050",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketlocation",le="0.100",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketlocation",le="0.250",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketlocation",le="0.500",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketlocation",le="1.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketlocation",le="10.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketlocation",le="2.500",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketlocation",le="5.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketobjectlockconfiguration",le="+Inf",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketobjectlockconfiguration",le="0.050",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketobjectlockconfiguration",le="0.100",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketobjectlockconfiguration",le="0.250",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketobjectlockconfiguration",le="0.500",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketobjectlockconfiguration",le="1.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketobjectlockconfiguration",le="10.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketobjectlockconfiguration",le="2.500",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="getbucketobjectlockconfiguration",le="5.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="headbucket",le="+Inf",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="headbucket",le="0.050",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="headbucket",le="0.100",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="headbucket",le="0.250",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="headbucket",le="0.500",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="headbucket",le="1.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="headbucket",le="10.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="headbucket",le="2.500",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="headbucket",le="5.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="newmultipartupload",le="+Inf",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="newmultipartupload",le="0.050",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="newmultipartupload",le="0.100",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="newmultipartupload",le="0.250",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="newmultipartupload",le="0.500",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="newmultipartupload",le="1.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="newmultipartupload",le="10.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="newmultipartupload",le="2.500",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="newmultipartupload",le="5.000",server="127.0.0.1:9000"} 1
minio_s3_requests_ttfb_seconds_distribution{api="putobjectpart",le="+Inf",server="127.0.0.1:9000"} 306
minio_s3_requests_ttfb_seconds_distribution{api="putobjectpart",le="0.050",server="127.0.0.1:9000"} 306
minio_s3_requests_ttfb_seconds_distribution{api="putobjectpart",le="0.100",server="127.0.0.1:9000"} 306
minio_s3_requests_ttfb_seconds_distribution{api="putobjectpart",le="0.250",server="127.0.0.1:9000"} 306
minio_s3_requests_ttfb_seconds_distribution{api="putobjectpart",le="0.500",server="127.0.0.1:9000"} 306
minio_s3_requests_ttfb_seconds_distribution{api="putobjectpart",le="1.000",server="127.0.0.1:9000"} 306
minio_s3_requests_ttfb_seconds_distribution{api="putobjectpart",le="10.000",server="127.0.0.1:9000"} 306
minio_s3_requests_ttfb_seconds_distribution{api="putobjectpart",le="2.500",server="127.0.0.1:9000"} 306
minio_s3_requests_ttfb_seconds_distribution{api="putobjectpart",le="5.000",server="127.0.0.1:9000"} 306

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here