Adds AutocompleteTags and corresponding REST api #2332
Merged
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This adds an optional storage interface
AutocompleteTags
to theStorageComponent
and corresponding endpoints to support the UI./api/v2/autocompleteKeys
and/api/v2/autocompleteValues?key=http.host
Cache control is always set on the keys, and it is set conditionally on values when there are more than 3. The "more than 3" allows for a freshly booting system to not confuse users (we do the same thing on
/api/v2/spans?serviceName=foo
endpoint).The server accepts an environment variable
AUTOCOMPLETE_KEYS
which acts as a whitelist as storing values for every tag would be
expensive.