Today I spend most of my day trying to find an example for entitySelector where certain custom host metadata is present (or not present), after asking dynatrace support finally fot the right syntax for this
just want to share this as I was unable to find documentation or post related to this.
my starting point was a post from the community: https://community.dynatrace.com/t5/Open-Q-A/Entity-Selector/td-p/205554 however the details I needed were not part of the post
First, I don't know all the "sources" for customHostMetadata, you can start querying a single HOST to get the customHostMetadata using entities api (notice the fields, I am grabbing only properties.customHostMetadata )
https://dt-host/e/[env-id]/api/v2/entities?entitySelector=type(HOST),entityId(HOST-X)&fields=properties.customHostMetadata
Result will be something like:
{
"totalCount":1,
"pageSize":50,
"entities":[
{
"entityId":"HOST-XXXXXXXXXXXXX",
"type":"HOST",
"displayName":"random.madeup.server",
"properties":{
"customHostMetadata":[
{
"value":"hello",
"key":{
"source":"ENVIRONMENT",
"key":"myRealMetadata"
}
}
]
}
}
]
}
each value from customHostMetadata will contain source, key and value (if present), source is used in the next step
Now, the actual examples:
get all host where ENVIRONMENT (source) metada with name: myRealMetadata exists (regardless its value)
entitySelector=type(HOST),customHostMetadata([ENVIRONMENT]myRealMetadata)
the opposite (adding the "negate" statement):
entitySelector=type(HOST),not(customHostMetadata([ENVIRONMENT]myRealMetadata))
get all host where environment metada with name: myRealMetadata exists and has the value "hello"
entitySelector=type(HOST),customHostMetadata([ENVIRONMENT]myRealMetadata:hello)
