diff --git a/lib/galaxy/job_metrics/instrumenters/cgroup.py b/lib/galaxy/job_metrics/instrumenters/cgroup.py
index 62caef9c81dc..66da4f9389f9 100644
--- a/lib/galaxy/job_metrics/instrumenters/cgroup.py
+++ b/lib/galaxy/job_metrics/instrumenters/cgroup.py
@@ -114,18 +114,18 @@
 
 
 class CgroupPluginFormatter(formatting.JobMetricFormatter):
-    def format(self, key, value):
+    def format(self, key: str, value: Any) -> formatting.FormattedMetric:
         title = TITLES.get(key, key)
         if key in CONVERSION:
-            return title, CONVERSION[key](value)
+            return formatting.FormattedMetric(title, CONVERSION[key](value))
         elif key.endswith("_bytes"):
             try:
-                return title, nice_size(value)
+                return formatting.FormattedMetric(title, nice_size(value))
             except ValueError:
                 pass
         elif isinstance(value, (decimal.Decimal, numbers.Integral, numbers.Real)) and value == int(value):
             value = int(value)
-        return title, value
+        return formatting.FormattedMetric(title, str(value))
 
 
 class CgroupPlugin(InstrumentPlugin):
diff --git a/lib/galaxy/job_metrics/instrumenters/hostname.py b/lib/galaxy/job_metrics/instrumenters/hostname.py
index 721fa1aca419..1d7ea07165b3 100644
--- a/lib/galaxy/job_metrics/instrumenters/hostname.py
+++ b/lib/galaxy/job_metrics/instrumenters/hostname.py
@@ -3,21 +3,14 @@
 import logging
 
 from . import InstrumentPlugin
-from .. import formatting
 
 log = logging.getLogger(__name__)
 
 
-class HostnameFormatter(formatting.JobMetricFormatter):
-    def format(self, key, value):
-        return key, value
-
-
 class HostnamePlugin(InstrumentPlugin):
     """Gather hostname"""
 
     plugin_type = "hostname"
-    formatter = HostnameFormatter()
 
     def __init__(self, **kwargs):
         pass
diff --git a/lib/galaxy/job_metrics/instrumenters/meminfo.py b/lib/galaxy/job_metrics/instrumenters/meminfo.py
index 80e523d97308..9e1d9be1de27 100644
--- a/lib/galaxy/job_metrics/instrumenters/meminfo.py
+++ b/lib/galaxy/job_metrics/instrumenters/meminfo.py
@@ -1,6 +1,7 @@
 """The module describes the ``meminfo`` job metrics plugin."""
 
 import re
+from typing import Any
 
 from galaxy import util
 from . import InstrumentPlugin
@@ -14,9 +15,9 @@
 
 
 class MemInfoFormatter(formatting.JobMetricFormatter):
-    def format(self, key, value):
+    def format(self, key: str, value: Any) -> formatting.FormattedMetric:
         title = MEMINFO_TITLES.get(key, key)
-        return title, util.nice_size(value * 1000)  # kB = *1000, KB = *1024 - wikipedia
+        return formatting.FormattedMetric(title, util.nice_size(value * 1000))  # kB = *1000, KB = *1024 - wikipedia
 
 
 class MemInfoPlugin(InstrumentPlugin):