# History comparison of deleted parameters with null values ### Overview Deleted parameters that contained `null` values are not displayed in historical comparisons. Additionally, they do not display `Created At` or `Modified At` Times. A parameter named `empty.empty` contained a `null` value that was deleted . Since the parameter contained a null value `empty.empty` is not displayed in a projects historical differences table. ``` cloudtruth --project Demo parameters differences --as-of 2021-08-26 +-------------------+---------+----------------------+ | Parameter | Current | 2021-08-26T00:00:00Z | +-------------------+---------+----------------------+ | empty | - | | | empty.empty_empty | - | | | lower | - | case | | nil | - | | | pill | red | - | +-------------------+---------+----------------------+ ``` The parameter `empty.empty` displays empty times when searching a project on a previous date. ``` cloudtruth --project Demo parameters ls -v --as-of 2021-08-26 --show-times +----------------------+---------------------------------------------------------------------------------------------+---------+----------+--------+-------------+-----------------------------+-----------------------------+ | Name | Value | Source | Type | Secret | Description | Created At | Modified At | +----------------------+---------------------------------------------------------------------------------------------+---------+----------+--------+-------------+-----------------------------+-----------------------------+ | CHARACTER | NEO | default | internal | false | | 2021-08-25T14:18:59.117018Z | 2021-08-25T14:18:59.117023Z | | TF_VAR_resource_tags | {"Name":"Cloudtruth-Instance","project":"CloudTruth Run Terraform","environment":"default"} | default | internal | false | | 2021-08-25T14:18:59.129339Z | 2021-08-25T14:18:59.129344Z | | empty | | default | internal | false | | 2021-08-25T14:18:59.119914Z | 2021-08-25T14:18:59.119919Z | | empty.empty | - | | internal | false | | | | | empty.empty_empty | | default | internal | false | | 2021-08-25T14:18:59.120008Z | 2021-08-25T14:18:59.120013Z | | lower | case | default | internal | false | | 2021-08-25T14:18:59.122449Z | 2021-08-25T14:18:59.122454Z | | nil | | default | internal | false | | 2021-08-25T14:18:59.122730Z | 2021-08-25T14:18:59.122735Z | | node.name | "${NODE_NAME}" | default | internal | false | | 2021-08-25T14:18:59.122762Z | 2021-08-25T14:18:59.122766Z | | secret | ***** | default | internal | true | | 2021-08-25T14:18:59.123741Z | 2021-08-25T14:18:59.123746Z | | service.app.cpu | 4 | default | internal | false | | 2021-08-25T14:18:59.126921Z | 2021-08-25T14:18:59.126925Z | | service.app.memory | 8 | default | internal | false | | 2021-08-25T14:18:59.126952Z | 2021-08-25T14:18:59.126957Z | | service.demo.timeout | 200 | default | internal | false | | 2021-08-25T14:18:59.127014Z | 2021-08-25T14:18:59.127019Z | +----------------------+---------------------------------------------------------------------------------------------+---------+----------+--------+-------------+-----------------------------+-----------------------------+ ``` ### Resolution You can view a list of values a project contained by directly passing a date to a project and viewing the values and comparing the parameters to a current listing. **Parameters listed as of 2021-08-26** ``` cloudtruth --project Demo parameters ls -v --as-of 2021-08-26 +----------------------+---------------------------------------------------------------------------------------------+---------+----------+--------+-------------+ | Name | Value | Source | Type | Secret | Description | +----------------------+---------------------------------------------------------------------------------------------+---------+----------+--------+-------------+ | CHARACTER | NEO | default | internal | false | | | TF_VAR_resource_tags | {"Name":"Cloudtruth-Instance","project":"CloudTruth Run Terraform","environment":"default"} | default | internal | false | | | empty | | default | internal | false | | | empty.empty | - | | internal | false | | | empty.empty_empty | | default | internal | false | | | lower | case | default | internal | false | | | nil | | default | internal | false | | | node.name | "${NODE_NAME}" | default | internal | false | | | secret | ***** | default | internal | true | | | service.app.cpu | 4 | default | internal | false | | | service.app.memory | 8 | default | internal | false | | | service.demo.timeout | 200 | default | internal | false | | +----------------------+---------------------------------------------------------------------------------------------+---------+----------+--------+-------------+ ``` **Comparing the current parameters** we can find the parameter `empty.empty` is a deleted and contained a null value. ``` cloudtruth --project Demo parameters ls -v +----------------------+---------------------------------------------------------------------------------------------+---------+----------+--------+-------------+ | Name | Value | Source | Type | Secret | Description | +----------------------+---------------------------------------------------------------------------------------------+---------+----------+--------+-------------+ | CHARACTER | NEO | default | internal | false | | | TF_VAR_resource_tags | {"Name":"Cloudtruth-Instance","project":"CloudTruth Run Terraform","environment":"default"} | default | internal | false | | | node.name | "${NODE_NAME}" | default | internal | false | | | pill | red | default | internal | false | | | secret | ***** | default | internal | true | | | service.app.cpu | 4 | default | internal | false | | | service.app.memory | 8 | default | internal | false | | | service.demo.timeout | 200 | default | internal | false | | +----------------------+---------------------------------------------------------------------------------------------+---------+----------+--------+-------------+ ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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