Update prometheus buckets

[zakir-hyder]

Update to 0.1, 0.2, 0.3, 0.5, 0.75, 1, 1.5, 2, 3, 5, 7, 10, 15, 20 to better capture slow requests up to 15-20 seconds while focusing on the typical range

0.1, 0.2, 0.3, 0.5, 0.75, 1, 1.5, 2, 3, 5, 7, 10, 15, 20

Why This Range?

• Starts at 0.1s: our mean response times (285-548 ms) suggest most requests are above 0.1s, so smaller buckets like 0.005s are likely underutilized.
  • Fine-grained up to 1s: Buckets like 0.1, 0.2, 0.3, 0.5, 0.75, 1 provide good granularity where most requests fall.
  • Wider spacing for slower requests: 1.5, 2, 3, 5, 7, 10, 15, 20 capture the tail, ensuring requests up to 15s (or even 20s) are tracked explicitly.
• Total Buckets: 14, reducing metric cardinality.

[ashraful88]

this is not this library md-gin-prometheus-middleware is a different repo

[zakir-hyder]

this coming from kl's pr

[ashraful88]

we need to test and make sure this upgrades will not impact anything in the library

[zakir-hyder]

removing this pr and creating new one #16