Instrument metrics

[XSAM]

Closes #73

[codecov]

Codecov Report

Merging #74 (55851ae) into main (0b4b4fe) will increase coverage by 0.9%.
The diff coverage is 84.0%.

@@           Coverage Diff           @@
##            main     #74     +/-   ##
=======================================
+ Coverage   80.0%   80.9%   +0.9%     
=======================================
  Files         11      12      +1     
  Lines        425     647    +222     
=======================================
+ Hits         340     524    +184     
- Misses        75     101     +26     
- Partials      10      22     +12     

Impacted Files	Coverage Δ
instruments.go	60.6% <60.6%> (ø)
config.go	91.6% <70.0%> (-8.4%)	⬇️
sql.go	83.1% <83.8%> (+1.3%)	⬆️
conn.go	78.5% <100.0%> (+4.6%)	⬆️
connector.go	100.0% <100.0%> (ø)
option.go	100.0% <100.0%> (ø)
rows.go	56.5% <100.0%> (+4.1%)	⬆️
stmt.go	80.3% <100.0%> (+3.8%)	⬆️
tx.go	100.0% <100.0%> (ø)
utils.go	100.0% <100.0%> (ø)
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0b4b4fe...55851ae. Read the comment docs.