Add remaining network sdkstats metrics for A365

[rads-1996]

Adding the remaining metrics -

_REQ_DURATION_NAME,
_REQ_EXCEPTION_NAME,
_REQ_FAILURE_NAME,
_REQ_RETRY_NAME,
_REQ_THROTTLE_NAME,

I will raise another PR for OTLP once this PR is merged.

[rads-1996]

Retry Count and Request Duration

Throttle Count

Exception Count

Failure Count

[github-actions]

Performance comparison

Threshold: regressions >15.0% on gating scenarios fail the build. Higher ops/s is better; positive Δ means the PR is slower.

Scenario	Gating	Baseline (ops/s)	Candidate (ops/s)	Δ %	Status
azure_monitor_log	yes	26,406.1	25,659.4	+2.91%	✅
azure_monitor_span	yes	154,990.7	154,273.4	+0.46%	✅
otel_log	no	31,900.0	31,368.6	+1.69%	✅
otel_span	no	34,383.2	33,640.6	+2.21%	✅

[Copilot]

Pull request overview

This PR extends the distro’s SDKStats “network” metrics support (primarily for the Agent365 exporter) by adding the remaining upstream statsbeat metric names and wiring up additional observable gauge callbacks, along with comprehensive unit tests to validate the new record/observe behavior.

Changes:

• Add new sdkstats helpers/constants for request duration, failure, retry, throttle, and exception metrics (plus throttle status codes re-export).
• Attach callbacks for all six upstream statsbeat network gauges (success + 5 additional metrics) and add per-metric observation logic.
• Expand tests to cover new record helpers, new observation callbacks, and Agent365 exporter emission behavior.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
tests/test_sdkstats.py	Adds unit tests for new record_* helpers, new _observe_* callbacks, and verifies all six gauges are attached.
tests/a365/test_exporter.py	Adds Agent365 exporter tests verifying duration/failure/retry/throttle/exception metrics are recorded correctly.
src/microsoft/opentelemetry/a365/core/exporters/agent365_exporter.py	Records additional sdkstats metrics during _post_with_retries (duration, retry, failure/throttle, exception).
src/microsoft/opentelemetry/_sdkstats/_utils.py	Adds shared record helpers and expands _REQUESTS_MAP to include new metric buckets.
src/microsoft/opentelemetry/_sdkstats/_network_metrics.py	Adds observation callbacks for the additional metrics and registers them against upstream gauges.
src/microsoft/opentelemetry/_sdkstats/_constants.py	Re-exports additional upstream statsbeat metric names and throttle status codes.
src/microsoft/opentelemetry/_distro.py	Adjusts the sdkstats cikey placeholder value when Azure Monitor is disabled.

Comments suppressed due to low confidence (1)

src/microsoft/opentelemetry/a365/core/exporters/agent365_exporter.py:399

• time.time() is wall-clock time and can jump (NTP/manual clock changes), which can produce negative/incorrect durations. For request timing, prefer a monotonic clock like time.perf_counter() for both start and elapsed calculations.

            start_time = time.time()
            try:
                resp = self._session.post(
                    url,
                    data=body.encode("utf-8"),

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