chore(main): release 1.6.0

[github-actions]

🤖 I have created a release beepboop

1.6.0 (2026-04-25)

Features

• Add logic for handling content negotation flag with OM2 (#1986) (0fa1ad7)
• Add OM2 native histogram text output (#2042) (dec8e5b)
• add OTel preserve_names for scrape-time suffix handling (#1956) (f794288)
• compositeValues and exemplarCompliance flags for OM2 writer (#1991) (ff48ae8)
• move suffix handling to scrape time (#1955) (5a5106c)
• OM2 writer outputs names as provided, no suffix appending (#1957) (5ce2b57)

Bug Fixes

• deps: update dependency com.google.guava:guava to v33.6.0-jre (#2021) (1382693)
• deps: update dependency commons-io:commons-io to v2.22.0 (#2044) (9e05c1d)
• deps: update dependency io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha to v2.27.0-alpha (#2022) (30ac534)
• deps: update dependency io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha to v2.27.0-alpha (#2023) (2d51a32)
• deps: update dependency io.prometheus:prometheus-metrics-bom to v1.5.1 (#2004) (650ce4b)
• deps: update dependency org.apache.tomcat.embed:tomcat-embed-core to v11.0.21 (#2005) (7a36df7)
• deps: update dependency org.springframework.boot:spring-boot-starter-parent to v4.0.5 (#2006) (0106c18)
• deps: update dependency org.springframework.boot:spring-boot-starter-parent to v4.0.6 (#2046) (40a9db8)
• deps: update jetty monorepo to v12.1.8 (#2007) (acab5b2)
• deps: update protobuf (#2024) (8e2214e)
• pass release tag as input to deploy workflow (#1982) (165c921)
• pin grafana/otel-lgtm to 0.7.2 in OATs acceptance test (#1992) (f17ad9a)
• Relax metric name validation in Dropwizard5 (#1985) (deb782f)
• stabilize flaky timer and thread count tests (#1973) (ce5867b)
• Tighten OM2 summary and start timestamp output (#2041) (5699469)
• trigger Maven deploy from release-please via workflow_dispatch (#1981) (698f956)

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[github-actions]

🤖 Created releases:

• v1.6.0

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