statsd receiver does not handle empty tag values

[srolel]

Component(s)

receiver/statsd

What happened?

Description

When sending a metric with a tag with an empty value, the metric is not processed by statsd receiver.

Steps to Reproduce

it's something like "test.metric:42|c|#key:".

I added a test to statsd_parser_test.go and the result is

Error:      	Received unexpected error:
        	            	invalid tag format: "key:"

Expected Result

metric is processed (datadog agent handles this case)

Actual Result

metric is dropped

Collector version

v0.122.1

Environment information

Environment

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

OpenTelemetry Collector configuration

Log output

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/statsd: @jmacd @dmitryax

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[srolel]

had to set enable_simple_tags: true!