Escape JSON strings in zcl_amp_conv_http_json

[ThoralfHaensel]

The ABAP method "escape" can be used to escape all JSON strings (keys and values) in zcl_amp_conv_http_json.

https://help.sap.com/doc/abapdocu_751_index_htm/7.51/en-us/abenescape_functions.htm#@@ITOC@@ABENESCAPE_FUNCTIONS_3

[JohannesKonings]

replacement of the regex:

abap-metrics-provider/src/zamp_converter/zcl_amp_conv_http_json.clas.abap

Line 39 in 385a553

REPLACE ALL OCCURRENCES OF REGEX `(["\\\/])` IN metric_key WITH `\\$0`.

Maybe also addition to the unit tests
https://github.com/abap-observability-tools/abap-metrics-provider/blob/main/src/zamp_converter/zcl_amp_conv_http_json.clas.testclasses.abap