Observability exporter init (#2)

* add list of default metrics in readme

* init new observability exporter, delete old metrics exporter

* metrics exporter work

* metrics exporter work

* metrics exporter work

* metrics exporter work

* metrics exporter work

* metrics exporter work

* metrics exporter work

* metrics exporter work

* metrics exporter work

* metrics exporter work

* metrics exporter work

* metrics exporter work

* various

* readme update

Author: paulparkinson

Dockerfile

@@ -0,0 +1,5 @@
+FROM openjdk:11-jre-slim
+
+ENTRYPOINT ["java", "-jar", "/usr/share/observability-exporter.jar"]
+
+ADD target/observability-exporter-0.1.0.jar /usr/share/observability-exporter.jar

Logs.md

@@ -0,0 +1,18 @@
+## Logs Exporter
+
+###Log export entries contain the following elements:
+
+- `context`: Overall context of log entry
+- `logdesc`: Overall description of log entry
+- `timestampfield`: Field used to filter the time range for queries logged
+- `request`: The query used to retrieve log information. Values are logged in the format `[fieldname]=[fieldvalue]`
+
+The following is an example entry.
+
+```toml
+[[log]]
+context = "orderpdb_alertlogs"
+logdesc = "alert logs for order PDB"
+timestampfield = "ORIGINATING_TIMESTAMP"
+request = "select ORIGINATING_TIMESTAMP, MODULE_ID, EXECUTION_CONTEXT_ID, MESSAGE_TEXT from V$diag_alert_ext"
+```

Makefile

@@ -0,0 +1,23 @@
+## Metrics Exporter 
+
+###Metrics export entries contain the following elements:
+
+- `context`: Overall context of log entry
+- `metricsdesc`: Description of metric that maps to values obtained via `request`
+- `labels`: Field used to create labels for metric that maps to values obtained via `request`
+- `request`: The query used to retrieve metric information. 
+
+The following are example entries both without and with labels.
+
+```toml
+[[metric]]
+context = "context_no_label"
+request = "SELECT 1 as value_1, 2 as value_2 FROM DUAL"
+metricsdesc = { value_1 = "Simple example returning always 1.", value_2 = "Same but returning always 2." }
+
+[[metric]]
+context = "context_with_labels"
+labels = [ "label_1", "label_2" ]
+request = "SELECT 1 as value_1, 2 as value_2, 'First label' as label_1, 'Second label' as label_2 FROM DUAL"
+metricsdesc = { value_1 = "Simple example returning always 1.", value_2 = "Same but returning always 2." }
+```