build(deps): bump slog from 2.7.0 to 2.8.0

[dependabot]

Bumps slog from 2.7.0 to 2.8.0.

Release notes

Sourced from slog's releases.

Enable nested-values feature by default

This is the biggest slog release since v2.0! It contains many smaller fixes and improvements to slog that have been accumulated across 5 years and 127 commits.

The nested-values feature was already present in slog, and allows logging serde::Serialize types in addition to primitives. Previously, the nested-values feature had to be enabled not just in slog but also in each drain crate (slog_json, slog_term, slog_async, etc). Enabling this feature by default makes the crate easier to use and avoids several papercts. It should have no runtime overhead if not used and low compile-time overhead thanks to the new serde_core crate.

Another major feature is Logger::flush, which explicitly flushes buffered log messages. The next major release of slog_json, slog_async, etc., will also include support for this feature, in addition to enabling nested-values by default.

Changelog

The following has been copied from CHANGELOG.md

Highlights

• Enables the nested-values feature by default. The next major release of slog_json, slog_term, etc should also enable this feature by default.
• Added Logger::flush and Drain::flush methods.
• Improved support for logging errors
  • Have # log specifier transparently support & references to error
  • Implement slog::Value for Box<dyn std::error::Error> and anyhow::Error
• Define a prelude module for common imports
• Upgraded to Rust 2018 and require Rust 1.61
  • Deprecate the old slog_log! macros in favor of slog::log!
• Many internal improvements & bug fixes

Changed

• Enables the nested-values feature by default.
• Updated to Rust 2018
  • NOTE: Old 2015 crates will still work because of excellent 2015/2018 compatibility
• Bump MSRV to 1.61
  • This is already required for erased-serde, syn, serde_core, and many other important crates in the rust ecosystem.
• Update erased-serde from v0.3 to v0.4
• Depend on [serde_core] rather than serde to reduce compile times.

Added

• Added a Logger::flush and Drain::flush methods
  • Since this is a new method, not all drains implement it. Calling it on an unsupported drain will give an error
• Define a prelude module for common imports. Replace use slog::{Serde, Logger, info, debug, trace} with use slog::prelude::*
• Optionally implement Drain for [parking_lot::Mutex]. This is noticeably faster than std::sync::Mutex, is smaller, and avoids poisoning.
  • This feature has a separate name per version to allow supporting multiple versions of parking_lot at once. The current version (v0.12) has feature name parking_lot_0_12
• Implement slog::Value for dyn std::error::Error and Box<dyn std::error:Error (along with the Send/Sync versions).
• Optionally implement slog::Value for [anyhow::Error] (requires anyhow feature)
• Add ErrorRef wrapper to enable logging error references (PR #327)
  • The # error formatter in macros was updated to automatically select ErrorValue or ErrorRef (PR #328)
• Add emit_bytes method (PR #290)
  • Control formatting using BytesKind enum
• Implement Value for std::borrow::Cow

Deprecated

• Deprecate old prefixed macros like slog_log.

... (truncated)

Changelog

Sourced from slog's changelog.

[2.8.0] - 2025-10-05

This is the biggest slog release since 2.0. It fully preserves compatibility with prior releases.

Highlights

• Enables the nested-values feature by default. The next major release of slog_json, slog_term, etc should also enable this feature by default.
• Added Logger::flush and Drain::flush methods.
• Improved support for logging errors
  • Have # log specifier transparently support & references to error
  • Implement slog::Value for Box<dyn std::error::Error> and anyhow::Error
• Define a prelude module for common imports
• Upgraded to Rust 2018 and require Rust 1.61
  • Deprecate the old slog_log! macros in favor of slog::log!
• Many internal improvements & bug fixes

Changed

• Enables the nested-values feature by default.
• Updated to Rust 2018
  • NOTE: Old 2015 crates will still work because of excellent 2015/2018 compatibility
• Bump MSRV to 1.61
  • This is already required for erased-serde, syn, serde_core, and many other important crates in the rust ecosystem.
• Update erased-serde from v0.3 to v0.4
• Depend on [serde_core] rather than serde to reduce compile times.

Added

• Added a Logger::flush and Drain::flush methods
  • Since this is a new method, not all drains implement it. Calling it on an unsupported drain will give an error
• Define a prelude module for common imports. Replace use slog::{Serde, Logger, info, debug, trace} with use slog::prelude::*
• Optionally implement Drain for [parking_lot::Mutex]. This is noticeably faster than std::sync::Mutex, is smaller, and avoids poisoning.
  • This feature has a separate name per version to allow supporting multiple versions of parking_lot at once. The current version (v0.12) has feature name parking_lot_0_12
• Implement slog::Value for dyn std::error::Error and Box<dyn std::error:Error (along with the Send/Sync versions).
• Optionally implement slog::Value for [anyhow::Error] (requires anyhow feature)
• Add ErrorRef wrapper to enable logging error references (PR #327)
  • The # error formatter in macros was updated to automatically select ErrorValue or ErrorRef (PR #328)
• Add emit_bytes method (PR #290)
  • Control formatting using BytesKind enum
• Implement Value for std::borrow::Cow

Deprecated

• Deprecate old prefixed macros like slog_log. Rust 2018 macro paths like slog::log! make these unnecessary.

Fixed

• Fix logging of references to errors (resolved by introduction of ErrorRef in PR #327)
• Take advantage of the fact that in 1.81 [std::error::Error] has been moved to core. On this rust version, slog now supports the error trait without requiring std.
• Add #[must_use] to most public types, including slog::Logger, slog::OwnedKV, and slog::FnValue.

... (truncated)

Commits

• ec46dcc Bump version to v2.8.0
• a447574 Use serde_core instead of serde
• 60add84 ci: Run rustdoc in CI, forbidding warnings
• 640c150 Fix outstanding rustdoc warnings
• c52367f ci: Add anyhow to test feature matrix
• a59a459 More detailed docs for Drain::flush
• 1d2d9fe Make Duplicate::flush more robust on failure
• 559df85 Add FlushError::Custom wrapping a Box<dyn Error>
• fb98190 Define a Drain::flush method
• 79b5770 ci: Use Swatinem/rust-cache action
• Additional commits viewable in compare view

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