Allow array values for attributes #368
Conversation
tigrannajaryan
requested review from
AloisReitbauer,
bogdandrutu,
c24t,
carlosalberto,
iredelmeier,
jmacd,
reyang,
SergeyKanzhelev,
songy23,
tedsuo and
yurishkuro
as code owners
Resolves open-telemetry#341 Array values are useful for representing attributes that can have multiple values (e.g. representing a Memcached `get` that can be over multiple keys and making the keys a span attribute). This change allows homogeneous array values for span attributes and specifies that array values should be JSON encoded stirng when exporting using protocols that do not natively support array values.
tigrannajaryan
force-pushed
the
feature/tigran/multivalue
branch
from
06568ed to
51baa9a
Compare
| value, or a numeric type. | ||
| - (Required) The attribute value, which is either: | ||
| - A primitive type: string, boolean or numeric. | ||
| - An array of primitive type values. The array MUST be homogeneous, |
There was a problem hiding this comment.
I think the requirement is not to support array, but a map so that you have {"http" : {"url":...,...}}
There was a problem hiding this comment.
Before accepting this, I am curios to see all the requirements. Is only map/array that we need?
There was a problem hiding this comment.
The only requirement we have so far is in #341 and it is only for arrays, not maps.
There was a problem hiding this comment.
I remember for sure that I saw the map requirement documented as well, for the example I mentioned in the previous post.
There was a problem hiding this comment.
To complete the JSON structure, we'd allow a null value in addition to the ones already discussed. There may be some connection to the discussion about unspecified values for metric labels.
(For the record, I don't think that metric labels need to support lists or maps of values--but I also don't see a problem with coercing JSON lists or maps to strings when used as metric labels. Supporting a null value distinct from the string "null" or empty string would let provide a satisfying answer to the question about unspecified values--whereas the current state was not completely satisfying.)
There was a problem hiding this comment.
This is only for Span and Resource attributes. It does not affect metric labels.
| value, or a numeric type. | ||
| - (Required) The attribute value, which is either: | ||
| - A primitive type: string, boolean or numeric. | ||
| - An array of primitive type values. The array MUST be homogeneous, |
There was a problem hiding this comment.
To complete the JSON structure, we'd allow a null value in addition to the ones already discussed. There may be some connection to the discussion about unspecified values for metric labels.
(For the record, I don't think that metric labels need to support lists or maps of values--but I also don't see a problem with coercing JSON lists or maps to strings when used as metric labels. Supporting a null value distinct from the string "null" or empty string would let provide a satisfying answer to the question about unspecified values--whereas the current state was not completely satisfying.)
There was a problem hiding this comment.
@tigrannajaryan as a followup from the discussions in this thread I think we need to file an issue to discuss the support of the maps. @Oberon00 @arminru I think this idea of supporting a map was discuss during some discussions about typed spans.
Added a an issue to discuss: #376 |
|
@open-telemetry/specs-approvers can we merge this? |
Resolves open-telemetry#341 Array values are useful for representing attributes that can have multiple values (e.g. representing a Memcached `get` that can be over multiple keys and making the keys a span attribute). This change allows homogeneous array values for span attributes and specifies that array values should be JSON encoded stirng when exporting using protocols that do not natively support array values.
Resolves open-telemetry#341 Array values are useful for representing attributes that can have multiple values (e.g. representing a Memcached `get` that can be over multiple keys and making the keys a span attribute). This change allows homogeneous array values for span attributes and specifies that array values should be JSON encoded stirng when exporting using protocols that do not natively support array values.
Resolves #341
Array values are useful for representing attributes that can have
multiple values (e.g. representing a Memcached
getthat can beover multiple keys and making the keys a span attribute).
This change allows homogeneous array values for span attributes
and specifies that array values should be JSON encoded string when
exporting using protocols that do not natively support array values.