Logs Implement

[fuaiyi]

Background

Our company is also using OpenTelemetry standard for observability. I have been paying attention to the construction of OpenTelemetry, but I found that the Logs capability is not provided. so we developed the implementation of Logs by referring to the design standard. Recently, the community started developing Logs after the Metric stable release was completed. so I want to contribute the code that has been done with reference to the community's latest specifications and style, as well as the recent implementation of Logs in java, to build on and improve the capability of Logs. Accelerate the building of Logs capability so that developers like me can use the stable version of OpenTelemetry capability sooner rather than later. Welcome to participate in the CR and discussion.

PR

This PR is mainly to develop and improve the Logs signal ecology, including the following contents (there are a lot of contents, CR can be divided into modules).

• api-logs
• sdk-logs
• exporter-logs-otlp-http

api-logs

Module directory: experimental/packages/API - logs
Detail: in the process of development, it is found that the existing api-logs (v0.34.0) is inconsistent with the design standard and fails to meet part of the sdk capabilities, so a part of the code is reconstructed after referring to the design standard and java implementation. The main details are as follows:

1. delete LogEvent
2. Logger implements: emitLogRecord -> modification; getLogRecord; emitEvent -> getLogEvent
3. LogRecord modification (I think the LogRecord in api should provide the corresponding method and configuration, rather than the specific data model, can refer to the implementation in Trace)
4. implementation of NoopLogger
5. add NoopLogRecord
6. modify the unit test
7. modify README

sdk-logs

Module directory: experimental/packages/sdk-logs、packages/opentelemetry-core/src/utils
Detail: this module is a completely new module. According to the design standards of sdk and the implementation of java, the Logs SDK complete capability is completed. The functions are as follows:

1. LoggerProvider
2. Logger
3. LogRecord
4. ReadableLogRecord
5. LogRecordProcessor
6. SimpleLogRecordProcessor
7. BatchLogRecordProcessor
8. LogRecordExporter
9. ConslogLogRecordExporter
10. InMemoryLogRecordExporter
11. complete unit test
12. README
13. example of useage
14. add callWithTimeout tool method to @opentelemetry/core (see this method is used by Trace/Metric/Log, subsequent responsible person can directly replace the corresponding code with the method in core)

exporter-logs-otlp-http

Module directory: experimental/packages/exporter-logs-otlp-http、experimental/packages/otlp-transformer
Note: this module is completely new. It implements the full capabilities of exporter- OTLP-HTTP in accordance with the design standards of exporter-otlp and with reference to the java implementation. The functions are as follows:

1. OTLPLogExporter - web
2. OTLPLogExporter - node
3. logs-otlp-http implement in otlp-transformer
4. complete unit test
5. README

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