add decibel-milliwatt canonical unit

[markdowney]

What does this PR do?

Adds decibel-milliwatt to the list of canonical unit names. Third step of instructions to add a a new canonical unit

Related PRs:

• https://github.com/DataDog/dd-source/pull/425820
• https://github.com/DataDog/dogweb/pull/165701

Motivation

The agent wlan core check has been emitting a system.wlan.rssi metric without a unit and dBm is a missing canonical unit.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[dd-octo-sts]

⚠️ Recommendation: Add qa/skip-qa label

This PR does not modify any files shipped with the agent.

To help streamline the release process, please consider adding the qa/skip-qa label if these changes do not require QA testing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.95%. Comparing base (c0767bc) to head (512f8aa).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

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[datadog-prod-us1-6]

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

🧪 158 Tests failed

test_e2e_cisco_legacy_wlc from test_e2e_core.py     (Fix with Cursor)

Needed at least 1 candidates for 'snmp.device.reachable', got 0
Expected:
        MetricStub(name='snmp.device.reachable', type=0, value=1, tags=['agent_host:runnervmrc6n4', 'device_hostname:DDOGWLC', 'device_id:default:172.18.0.2', 'device_ip:172.18.0.2', 'device_namespace:default', 'device_vendor:cisco', 'snmp_device:172.18.0.2', 'snmp_host:DDOGWLC', 'snmp_profile:cisco-legacy-wlc'], hostname=None, device=None, flush_first_value=None)
Difference to closest:
        Expected tag agent_host:runnervmrc6n4
        Found agent_host:None
        Expected tag device_hostname:DDOGWLC
        Found device_hostname:None
        Expected tag device_id:default:172.18.0.2
        Found device_id:None
...

test_e2e_cisco_nexus from test_e2e_core.py     (Fix with Cursor)

Needed at least 1 candidates for 'snmp.device.reachable', got 0
Expected:
        MetricStub(name='snmp.device.reachable', type=0, value=1, tags=['agent_host:runnervmrc6n4', 'device_hostname:Nexus-eu1.companyname.managed', 'device_id:default:172.18.0.2', 'device_ip:172.18.0.2', 'device_namespace:default', 'device_vendor:cisco', 'snmp_device:172.18.0.2', 'snmp_host:Nexus-eu1.companyname.managed', 'snmp_profile:cisco-nexus'], hostname=None, device=None, flush_first_value=None)
Difference to closest:
        Expected tag agent_host:runnervmrc6n4
        Found agent_host:None
        Expected tag device_hostname:Nexus-eu1.companyname.managed
        Found device_hostname:None
        Expected tag device_id:default:172.18.0.2
        Found device_id:None
...

test_e2e_core_cisco_csr from test_e2e_core.py     (Fix with Cursor)

Needed at least 1 candidates for 'snmp.device.reachable', got 0
Expected:
        MetricStub(name='snmp.device.reachable', type=0, value=1, tags=['agent_host:runnervmrc6n4', 'device_id:default:172.18.0.2', 'device_ip:172.18.0.2', 'device_namespace:default', 'device_vendor:cisco', 'snmp_device:172.18.0.2', 'snmp_profile:cisco-csr1000v'], hostname=None, device=None, flush_first_value=None)
Difference to closest:
        Expected tag agent_host:runnervmrc6n4
        Found agent_host:None
        Expected tag device_id:default:172.18.0.2
        Found device_id:None
        Expected tag device_ip:172.18.0.2
        Found device_ip:None
...

View all

ℹ️ Info

No other issues found (see more)

❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 87.50% (+0.11%)

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[dd-octo-sts]

Validation Report

All 20 validations passed.

Show details

Validation	Description	Status
agent-reqs	Verify check versions match the Agent requirements file	✅
ci	Validate CI configuration and Codecov settings	✅
codeowners	Validate every integration has a CODEOWNERS entry	✅
config	Validate default configuration files against spec.yaml	✅
dep	Verify dependency pins are consistent and Agent-compatible	✅
http	Validate integrations use the HTTP wrapper correctly	✅
imports	Validate check imports do not use deprecated modules	✅
integration-style	Validate check code style conventions	✅
jmx-metrics	Validate JMX metrics definition files and config	✅
labeler	Validate PR labeler config matches integration directories	✅
legacy-signature	Validate no integration uses the legacy Agent check signature	✅
license-headers	Validate Python files have proper license headers	✅
licenses	Validate third-party license attribution list	✅
metadata	Validate metadata.csv metric definitions	✅
models	Validate configuration data models match spec.yaml	✅
openmetrics	Validate OpenMetrics integrations disable the metric limit	✅
package	Validate Python package metadata and naming	✅
readmes	Validate README files have required sections	✅
saved-views	Validate saved view JSON file structure and fields	✅
version	Validate version consistency between package and changelog	✅

View full run