collect height and target-height from info

this way we can figure out how far we are from the main chain's height
during sync

Signed-off-by: Ciro S. Costa <utxobr@protonmail.com>

.images.lock.yaml

@@ -3,7 +3,7 @@ kind: Config
 minimumRequiredVersion: 0.30.0
 overrides:
 - image: monero-exporter
-  newImage: index.docker.io/utxobr/monero-exporter@sha256:da1a13e78a9aeacac10b576824d4195a14bc1e5ba9919770d2f81cb9d32c0d4d
+  newImage: index.docker.io/utxobr/monero-exporter@sha256:c5c019718c37c40cf4335405d47e7fe46b892e55ff74a712bd49e084c8bb02b1
   preresolved: true
 - image: monero-exporter-grafana
   newImage: index.docker.io/utxobr/monero-exporter-grafana@sha256:f9c47963d3fb573166881baf1a9f2ad331500e34b4604d430f96957ab7bb1449

README.md

@@ -303,12 +303,14 @@ General information about this node.
 | monero_info_alternative_blocks | number of blocks alternative to the longest |
 | monero_info_block_size_limit | maximum hard limit of a block |
 | monero_info_block_size_median | current median size for computing dynamic fees |
+| monero_info_height | current height of the chain |
 | monero_info_mainnet | whether the node is connected to mainnet |
 | monero_info_offline | whether the node is offline |
-| monero_info_synchronized | |
+| monero_info_rpc_connections | number of rpc connections being served by the node |
+| monero_info_synchronized | whether the node's chain is in sync with the network|
+| monero_info_target_height | target height to achieve to be considered in sync |
 | monero_info_uptime_seconds_total | for how long this node has been up |
 
-
 ## License
 
 See [LICENSE](./LICENSE).

examples/docker-compose.yaml

@@ -15,7 +15,7 @@ services:
     command:
     - --monero-addr=http://127.0.0.1:18081
     container_name: monero-exporter
-    image: index.docker.io/utxobr/monero-exporter@sha256:da1a13e78a9aeacac10b576824d4195a14bc1e5ba9919770d2f81cb9d32c0d4d
+    image: index.docker.io/utxobr/monero-exporter@sha256:c5c019718c37c40cf4335405d47e7fe46b892e55ff74a712bd49e084c8bb02b1
     network_mode: service:monerod
   monerod:
     command:

hack/table-printer.awk

@@ -5,7 +5,7 @@
 #
 # [1] - https://help.github.com/articles/organizing-information-with-tables/
 #
-# Usage: `curl -s localhost:9100/metrics  | grep container_ | ./gh-table-printer`
+# Usage: `curl -s localhost:9000/metrics  | grep monero_ | ./gh-table-printer`
 
 BEGIN {
   print "| name | description |"

pkg/collector/collector_info.go

@@ -122,12 +122,42 @@ func (c *OverallCollector) collect() {
 	c.metricsC <- prometheus.MustNewConstMetric(
 		prometheus.NewDesc(
 			"monero_info_synchronized",
-			"",
+			"whether the node's chain is in sync with the network",
 			nil, nil,
 		),
 		prometheus.GaugeValue,
 		boolToFloat64(c.info.Synchronized),
 	)
+
+	c.metricsC <- prometheus.MustNewConstMetric(
+		prometheus.NewDesc(
+			"monero_info_height",
+			"current height of the chain",
+			nil, nil,
+		),
+		prometheus.GaugeValue,
+		float64(c.info.Height),
+	)
+
+	c.metricsC <- prometheus.MustNewConstMetric(
+		prometheus.NewDesc(
+			"monero_info_target_height",
+			"target height to achieve to be considered in sync",
+			nil, nil,
+		),
+		prometheus.GaugeValue,
+		float64(c.info.TargetHeight),
+	)
+
+	c.metricsC <- prometheus.MustNewConstMetric(
+		prometheus.NewDesc(
+			"monero_info_rpc_connections",
+			"number of rpc connections being served by the node",
+			nil, nil,
+		),
+		prometheus.GaugeValue,
+		float64(c.info.RPCConnectionsCount),
+	)
 }
 
 func boolToFloat64(b bool) float64 {