Merge branch 'open-telemetry:main' into main

Author: hilmarf

.chloggen/41571.yaml

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+change_type: breaking
+component: receiver/prometheus
+note: Remove the deprecated `report_extra_scrape_metrics` receiver configuration option and obsolete extra scrape metric feature gates.
+issues: [44181]
+subtext: |
+  `report_extra_scrape_metrics` is no longer accepted in `prometheusreceiver` configuration.
+  Control extra scrape metrics through the PromConfig.ScrapeConfigs.ExtraScrapeMetrics setting instead.
+change_logs: [user]

.chloggen/42355-fix-hostname.yaml

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+change_type: enhancement
+component: extension/sigv4auth
+note: Add support for External IDs when assuming roles in cross-account authentication scenarios
+issues: [44930]
+subtext: |
+  Added external_id field to the AssumeRole configuration, allowing users to specify
+  an External ID when assuming roles for enhanced cross-account security.
+change_logs: [user]

.chloggen/44181-prometheusreceiver-remove-report-extra-scrape-metrics.yaml

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+change_type: deprecation
+component: receiver/kafka
+note: Deprecate the built-in `azure_resource_logs` encoding in favour of `azureencodingextension`.
+issues: [46267]
+subtext: |
+  The built-in `azure_resource_logs` encoding does not support all timestamp formats
+  emitted by Azure services (e.g. US-format timestamps from Azure Functions).
+  Users should migrate to the [`azureencodingextension`](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/extension/encoding/azureencodingextension),
+  which provides full control over time formats and is actively maintained.
+change_logs: [user]

.chloggen/44528-prometheusreceiver-stable-hist-seriesref.yaml

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+change_type: enhancement
+
+component: receiver/expvar
+
+note: Enable the re-aggregation feature for the expvar receiver
+
+issues: [45396]
+
+subtext:
+
+change_logs: [user]