[exporter/mezmoexporter] Remove hardcoded "otel" hostname #13410
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Description:
This change removes the hardcoded "otel" hostname that was embedded
in outgoing logs data. It is replaced by:
hostname parameter.
value to fill in log metadata recognized upstream.
This is a breaking change, and as such will generate a startup
error if the exporter is configured to send to an endpoint that
does not support this feature.
Testing:
The changes in this PR were used to send data to the Mezmo service. The collector was configured with both a syslog receiver and a tcplog receiver. Data from each receiver was correctly received and stored in the Mezmo system.
Documentation:
All documentation associated with this exporter was updated to match the new requirements and changes to Mezmo's upstream documentation (re: our name change from LogDNA to Mezmo).