feat(tracing): migrate to OpenTelemetry OTLP and enrich trace metadata

[gaius-qi]

Description

This pull request introduces significant updates to the OpenTelemetry tracing setup in the dragonfly-client project. The changes modernize the tracing infrastructure by replacing the Jaeger exporter with an OTLP exporter and adding support for enhanced resource attributes. Additionally, the init_tracing function now accepts a Host parameter to provide contextual metadata for tracing.

Dependency Updates:

• Updated tracing-opentelemetry to version 0.30.0 and replaced Jaeger dependencies with OTLP-related dependencies (opentelemetry, opentelemetry-otlp, and opentelemetry_sdk). These changes enable the use of the OTLP exporter for tracing.

Code Updates for Tracing:

• Enhanced the init_tracing function to support the OTLP exporter by configuring opentelemetry_sdk::trace::SdkTracerProvider with resource attributes like idc, location, hostname, and ip. These attributes are derived from the new Host parameter.
• Introduced a SPAN_EXPORTER_TIMEOUT constant to define the timeout for the span exporter.

Function Signature Changes:

• Updated the init_tracing function to include an optional host: Option<Host> parameter, allowing the injection of host-specific metadata into the tracing setup.

Related Issue

Motivation and Context

Screenshots (if appropriate)

[Liam-Zhao]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 42 lines in your changes missing coverage. Please review.

Project coverage is 49.33%. Comparing base (1d63a07) to head (a49fe1e).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client/src/tracing/mod.rs	0.00%	36 Missing ⚠️
dragonfly-client-init/src/bin/main.rs	0.00%	1 Missing ⚠️
dragonfly-client/src/bin/dfcache/export.rs	0.00%	1 Missing ⚠️
dragonfly-client/src/bin/dfcache/import.rs	0.00%	1 Missing ⚠️
dragonfly-client/src/bin/dfcache/stat.rs	0.00%	1 Missing ⚠️
dragonfly-client/src/bin/dfdaemon/main.rs	0.00%	1 Missing ⚠️
dragonfly-client/src/bin/dfget/main.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1160      +/-   ##
==========================================
- Coverage   49.51%   49.33%   -0.18%     
==========================================
  Files          58       58              
  Lines       12085    12114      +29     
==========================================
- Hits         5984     5977       -7     
- Misses       6101     6137      +36     

Files with missing lines	Coverage Δ
dragonfly-client-init/src/bin/main.rs	0.00% <0.00%> (ø)
dragonfly-client/src/bin/dfcache/export.rs	0.00% <0.00%> (ø)
dragonfly-client/src/bin/dfcache/import.rs	0.00% <0.00%> (ø)
dragonfly-client/src/bin/dfcache/stat.rs	0.00% <0.00%> (ø)
dragonfly-client/src/bin/dfdaemon/main.rs	0.00% <0.00%> (ø)
dragonfly-client/src/bin/dfget/main.rs	25.09% <0.00%> (-0.04%)	⬇️
dragonfly-client/src/tracing/mod.rs	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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