[redisreceiver] Fix duration unit inconsistencies to comply with OTel guidelines

[shmsr]

Component(s)

receiver/redis

What happened?

Description

The Redis receiver has multiple duration metrics that don't comply with OpenTelemetry semantic conventions for units. According to OTel guidelines: "When instruments are measuring durations, seconds (i.e. s) SHOULD be used."

Affected metrics:

• redis.cmd.usec - uses us instead of s
• redis.latest_fork - uses us instead of s
• redis.db.avg_ttl - uses ms instead of s

Was checking out this PR when I saw @dmitryax's comment here and I found out some issues that we need to fix.

Steps to Reproduce

NA

Expected Result

All duration metrics should use seconds (s) as the unit according to OTel guidelines:

• redis.cmd.usec should report command execution time in seconds
• redis.latest_fork should report fork duration in seconds
• redis.db.avg_ttl should report average TTL in seconds

Actual Result

Duration metrics report in non-standard units that don't follow OTel conventions:

• redis.cmd.usec reports in microseconds (us)
• redis.latest_fork reports in microseconds (us)
• redis.db.avg_ttl reports in milliseconds (ms)

From metadata.yml:

  redis.cmd.usec:
    enabled: false
    description: Total time for all executions of this command
    unit: us
    sum:
      value_type: int
      monotonic: true
      aggregation_temporality: cumulative
    attributes: [cmd]
  redis.latest_fork:
    enabled: true
    description: Duration of the latest fork operation in microseconds
    unit: us
    gauge:
      value_type: int
  redis.db.avg_ttl:
    enabled: true
    description: "Average keyspace keys TTL"
    unit: ms
    gauge:
      value_type: int
    attributes: [db]

Collector version

v0.128.0

Environment information

Environment

OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

Log output

NA

Additional context

NA

[github-actions]

Pinging code owners:

• receiver/redis: @dmitryax @hughesjj

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[shmsr]

I'd like to take this one.

[VihasMakwana]

Sounds good to me.