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Adding or partially overriding attributes #358
Description
Unsure whether I'm not spotting the right incantation/flag to do this, or it is a feature request.
Under the following circumstances, it would be useful to be able to append/override attributes instead of overwriting them:
- When calling
span endon a span that already has attributes:TEST_SOCK=$(mktemp -d) otel-cli span background \ --name "test" \ --sockdir "${TEST_SOCK}" \ --attr "color=red,size=large" \ & # ... otel-cli span end \ --sockdir "${TEST_SOCK}" \ --attr "weight=100,size=small" # Want span with attributes { color=red, size=small, weight=100 }
- When calling any command with
--attrwhenOTEL_CLI_ATTRIBUTESis non-empty:OTEL_CLI_ATTRIBUTES="color=red,size=large" otel-cli exec \ --name "test" \ --attr "weight=100,size=small" \ work # Want span with attributes { color=red, size=small, weight=100 }
In OTel terms of other languages/instrumentations, it would give us Set Attributes-like capabilities. This could be an additional attribute argument (--add-attr and OTEL_CLI_ADDITIONAL_ATTRIBUTES?), or a flag (--preserve-attr and OTEL_CLI_PRESERVE_EXISTING_ATTRIBUTES?) modifying the behavior of --attr.
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