Metrics received over the protocol consists of metrics, tags, and fields and each metric also has a timestamp.
The metric is simply a name and each metric will be written to a table with the same name in the metric schema.
The listener uses the Influx line protocol, which is a simple protocol for sending metric data that is supported by Telegraf.
Each line of the line protocol consists of lines of the format:
measurementName,tagKey=tagValue fieldKey="fieldValue" 1465839830100400200
There is a single measurement name (also called "metric"), zero or more tag keys with values, and at least one field with a field value. The timestamp is optional, and is given in nanoseconds since the epoch. When parsing the line, quotes are removed from any quoted field value before being used as a literal string.
The grammar is very simple, but we use an even more simplified
version. We allow \ to escape any character in values and keys and
the actual interpretation of the strings will be done at a later
stage, so we do not bother about distinguishing integers from
floating-point numbers, nor bare strings from quoted strings (but we
remove the quotes).
Line = Ident, {",", Item}, " ", Item, {",", Item};
Item = Ident, "=", Value;
Ident = LETTER, {LETTER | DIGIT | "_" | "-"};
Value = QString | BString;
BString = LETTER, {"\", ANY | VALUE_CHAR};
QString = '"', {"\", ANY | STRING_CHAR}, '"';
VALUE_CHAR = ? any character except space, comma, or backslash ?;
STRING_CHAR = ? any character except quote or backslash ?;
LETTER = ? any letter ?;
DIGIT = ? any digit ?;| Port | Protocol | Description |
|---|---|---|
| 8089 | UDP | The default port that runs the UDP service. |
| 8086 | HTTP/TCP | The default port that runs the InfluxDB HTTP service. |