Collect timing metrics for CI jobs

.buildkite/hooks/post-checkout

@@ -0,0 +1,2 @@
+CI_BUILD_START=$(date +%s)
+export CI_BUILD_START

.buildkite/hooks/post-checkout.sh

@@ -0,0 +1 @@
+post-checkout

.buildkite/hooks/post-command

@@ -1,14 +1,50 @@
 #!/bin/bash -e
 
-[[ -n "$CARGO_TARGET_CACHE_NAME" ]] || exit 0
-
 #
 # Save target/ for the next CI build on this machine
 #
+if [[ -n $CARGO_TARGET_CACHE_NAME ]]; then
   (
     d=$HOME/cargo-target-cache/"$CARGO_TARGET_CACHE_NAME"
-  mkdir -p $d
+    mkdir -p "$d"
     set -x
-  rsync -a --delete --link-dest=$PWD target $d
-  du -hs $d
+    rsync -a --delete --link-dest="$PWD" target "$d"
+    du -hs "$d"
   )
+fi
+
+#
+# Add job_stats data point
+#
+if [[ -z $CI_BUILD_START ]]; then
+  echo Error: CI_BUILD_START empty
+else
+  CI_BUILD_DURATION=$(( $(date +%s) - CI_BUILD_START + 1 ))
+
+  CI_LABEL=${BUILDKITE_LABEL:-build label missing}
+
+  PR=false
+  if [[ $BUILDKITE_BRANCH =~ pull/* ]]; then
+    PR=true
+  fi
+
+  SUCCESS=true
+  if [[ $BUILDKITE_COMMAND_EXIT_STATUS != 0 ]]; then
+    SUCCESS=false
+  fi
+
+  point_tags="pipeline=$BUILDKITE_PIPELINE_SLUG,job=$CI_LABEL,pr=$PR,success=$SUCCESS"
+  point_tags="${point_tags// /\\ }"  # Escape spaces
+
+  point_fields="duration=$CI_BUILD_DURATION"
+  point_fields="${point_fields// /\\ }"  # Escape spaces
+
+  point="job_stats,$point_tags $point_fields"
+  echo "Influx data point: $point"
+  if [[ -n $INFLUX_USERNAME && -n $INFLUX_PASSWORD ]]; then
+    echo "https://metrics.solana.com:8086/write?db=ci&u=${INFLUX_USERNAME}&p=${INFLUX_PASSWORD}" \
+      | xargs curl -XPOST --data-binary "$point"
+  else
+    echo Influx user credentials not found
+  fi
+fi

.buildkite/hooks/post-command.sh

@@ -0,0 +1 @@
+post-command

.buildkite/hooks/pre-command

@@ -7,7 +7,7 @@
 #
 (
   d=$HOME/cargo-target-cache/"$CARGO_TARGET_CACHE_NAME"
-  mkdir -p $d/target
+  mkdir -p "$d"/target
   set -x
-  rsync -a --delete --link-dest=$d $d/target .
+  rsync -a --delete --link-dest="$d" "$d"/target .
 )

.buildkite/hooks/pre-command.sh

@@ -0,0 +1 @@
+pre-command