imports.md

World imports

• Imports:
  • interface wasi:logging/logging
  • interface wasi:observe/observe

Import interface wasi:logging/logging

WASI Logging is a logging API intended to let users emit log messages with simple priority levels and context values.

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Types

enum level

A log level, describing a kind of message.

Enum Cases

• trace

  Describes messages about the values of variables and the flow of control within a program.

• debug

  Describes messages likely to be of interest to someone debugging a program.

• info

  Describes messages likely to be of interest to someone monitoring a program.

• warn

  Describes messages indicating hazardous situations.

• error

  Describes messages indicating serious errors.

• critical

  Describes messages indicating fatal errors.

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Functions

log: func

Emit a log message.

A log message has a level describing what kind of message is being sent, a context, which is an uninterpreted string meant to help consumers group similar messages, and a string containing the message text.

Params

• level: level
• context: string
• message: string

Import interface wasi:observe/observe

---

Types

enum metric-format

Enum Cases

• statsd

---

Functions

metric: func

Emit a metric.

A metric has a format describing the format of the name parameter.

Params

• format: metric-format
• name: string

span-enter: func

Enter a named span.

Communicate to the o11y host that the guest is moving into a new span.

Params

• name: string

span-tags: func

Add tags to the current span.

Add a comma-delimited list of tags to the active span.

Params

• tags: string

span-exit: func

Exit the current span.

Communicate to the o11y host that the span is complete.