improv: update metrics interface to resemble other core utils

[to-mc]

Issue #, if available: #33

Description of changes:

Update Metrics to accept a "service" parameter to match Logger/Tracer. This parameter will be used as the metric namespace. Deprecated MetricManager.add_namespace env var.

BREAKING: Remove POWERTOOLS_METRICS_NAMESPACE, in favour of using the same environment variable as Logger/Tracer classes (POWERTOOLS_SERVICE_NAME).

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

[codecov-commenter]

Codecov Report

Merging #60 into develop will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop      #60   +/-   ##
========================================
  Coverage    99.38%   99.39%           
========================================
  Files           15       15           
  Lines          489      492    +3     
  Branches        44       44           
========================================
+ Hits           486      489    +3     
  Misses           3        3           

Impacted Files	Coverage Δ
aws_lambda_powertools/metrics/base.py	100.00% <100.00%> (ø)
aws_lambda_powertools/metrics/metric.py	100.00% <100.00%> (ø)
aws_lambda_powertools/metrics/metrics.py	100.00% <100.00%> (ø)

---

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 5e5c2f5...8a4eab7. Read the comment docs.

[heitorlessa]

LGTM - Minor typo only

[heitorlessa]

Are you still planning to add the service as a dimension? or will that be in a separate PR?

Could you also change docstring in line 89 in metrics.py:

        **Lambda function using tracer and metrics decorators**

            metrics = Metrics()

Thanks again, Tom!!

[to-mc]

Are you still planning to add the service as a dimension? or will that be in a separate PR?

I'm in two minds about adding a dimension with the service name. I'll create a separate issue/PR for that to discuss.

Could you also change docstring in line 89 in metrics.py:

        **Lambda function using tracer and metrics decorators**

            metrics = Metrics()

Done!

Thanks again, Tom!!

[heitorlessa]

LGTM!